// Knockout JavaScript library v2.1.0
// (c) Steven Sanderson - http://knockoutjs.com/
// License: MIT (http://www.opensource.org/licenses/mit-license.php)

(function(window, document, navigator, undefined) {
    var DEBUG = true;
    !function(factory) {
        // Support three module loading scenarios
        if (typeof require === 'function' && typeof exports === 'object' && typeof module === 'object') {
            // [1] CommonJS/Node.js
            var target = module['exports'] || exports; // module.exports is for Node.js
            factory(target);
        } else if (typeof define === 'function' && define['amd']) {
            // [2] AMD anonymous module
            define(['exports'], factory);
        } else {
            // [3] No module loader (plain <script> tag) - put directly in global namespace
            factory(window['ko'] = {});
        }
    }(function(koExports) {
// Internally, all KO objects are attached to koExports (even the non-exported ones whose names will be minified by the closure compiler).
// In the future, the following "ko" variable may be made distinct from "koExports" so that private objects are not externally reachable.
        var ko = typeof koExports !== 'undefined' ? koExports : {};
// Google Closure Compiler helpers (used only to make the minified file smaller)
        ko.exportSymbol = function(koPath, object) {
            var tokens = koPath.split(".");

            // In the future, "ko" may become distinct from "koExports" (so that non-exported objects are not reachable)
            // At that point, "target" would be set to: (typeof koExports !== "undefined" ? koExports : ko)
            var target = ko;

            for (var i = 0; i < tokens.length - 1; i++)
                target = target[tokens[i]];
            target[tokens[tokens.length - 1]] = object;
        };
        ko.exportProperty = function(owner, publicName, object) {
            owner[publicName] = object;
        };
        ko.version = "2.1.0";

        ko.exportSymbol('version', ko.version);
        ko.utils = new (function() {
            var stringTrimRegex = /^(\s|\u00A0)+|(\s|\u00A0)+$/g;

            // Represent the known event types in a compact way, then at runtime transform it into a hash with event name as key (for fast lookup)
            var knownEvents = {}, knownEventTypesByEventName = {};
            var keyEventTypeName = /Firefox\/2/i.test(navigator.userAgent) ? 'KeyboardEvent' : 'UIEvents';
            knownEvents[keyEventTypeName] = ['keyup', 'keydown', 'keypress'];
            knownEvents['MouseEvents'] = ['click', 'dblclick', 'mousedown', 'mouseup', 'mousemove', 'mouseover', 'mouseout', 'mouseenter', 'mouseleave'];
            for (var eventType in knownEvents) {
                var knownEventsForType = knownEvents[eventType];
                if (knownEventsForType.length) {
                    for (var i = 0, j = knownEventsForType.length; i < j; i++)
                        knownEventTypesByEventName[knownEventsForType[i]] = eventType;
                }
            }
            var eventsThatMustBeRegisteredUsingAttachEvent = { 'propertychange': true }; // Workaround for an IE9 issue - https://github.com/SteveSanderson/knockout/issues/406

            // Detect IE versions for bug workarounds (uses IE conditionals, not UA string, for robustness)
            var ieVersion = (function() {
                var version = 3, div = document.createElement('div'), iElems = div.getElementsByTagName('i');

                // Keep constructing conditional HTML blocks until we hit one that resolves to an empty fragment
                while (div.innerHTML = '<!--[if gt IE ' + (++version) + ']><i></i><![endif]-->',
                iElems[0]) ;
                return version > 4 ? version : undefined;
            }());
            var isIe6 = ieVersion === 6,
                isIe7 = ieVersion === 7;

            function isClickOnCheckableElement(element, eventType) {
                if ((ko.utils.tagNameLower(element) !== "input") || !element.type) return false;
                if (eventType.toLowerCase() != "click") return false;
                var inputType = element.type;
                return (inputType == "checkbox") || (inputType == "radio");
            }

            return {
                fieldsIncludedWithJsonPost: ['authenticity_token', /^__RequestVerificationToken(_.*)?$/],

                arrayForEach: function(array, action) {
                    for (var i = 0, j = array.length; i < j; i++)
                        action(array[i]);
                },

                arrayIndexOf: function(array, item) {
                    if (typeof Array.prototype.indexOf == "function")
                        return Array.prototype.indexOf.call(array, item);
                    for (var i = 0, j = array.length; i < j; i++)
                        if (array[i] === item)
                            return i;
                    return -1;
                },

                arrayFirst: function(array, predicate, predicateOwner) {
                    for (var i = 0, j = array.length; i < j; i++)
                        if (predicate.call(predicateOwner, array[i]))
                            return array[i];
                    return null;
                },

                arrayRemoveItem: function(array, itemToRemove) {
                    var index = ko.utils.arrayIndexOf(array, itemToRemove);
                    if (index >= 0)
                        array.splice(index, 1);
                },

                arrayGetDistinctValues: function(array) {
                    array = array || [];
                    var result = [];
                    for (var i = 0, j = array.length; i < j; i++) {
                        if (ko.utils.arrayIndexOf(result, array[i]) < 0)
                            result.push(array[i]);
                    }
                    return result;
                },

                arrayMap: function(array, mapping) {
                    array = array || [];
                    var result = [];
                    for (var i = 0, j = array.length; i < j; i++)
                        result.push(mapping(array[i]));
                    return result;
                },

                arrayFilter: function(array, predicate) {
                    array = array || [];
                    var result = [];
                    for (var i = 0, j = array.length; i < j; i++)
                        if (predicate(array[i]))
                            result.push(array[i]);
                    return result;
                },

                arrayPushAll: function(array, valuesToPush) {
                    if (valuesToPush instanceof Array)
                        array.push.apply(array, valuesToPush);
                    else
                        for (var i = 0, j = valuesToPush.length; i < j; i++)
                            array.push(valuesToPush[i]);
                    return array;
                },

                extend: function(target, source) {
                    if (source) {
                        for (var prop in source) {
                            if (source.hasOwnProperty(prop)) {
                                target[prop] = source[prop];
                            }
                        }
                    }
                    return target;
                },

                emptyDomNode: function(domNode) {
                    while (domNode.firstChild) {
                        ko.removeNode(domNode.firstChild);
                    }
                },

                moveCleanedNodesToContainerElement: function(nodes) {
                    // Ensure it's a real array, as we're about to reparent the nodes and
                    // we don't want the underlying collection to change while we're doing that.
                    var nodesArray = ko.utils.makeArray(nodes);

                    var container = document.createElement('div');
                    for (var i = 0, j = nodesArray.length; i < j; i++) {
                        ko.cleanNode(nodesArray[i]);
                        container.appendChild(nodesArray[i]);
                    }
                    return container;
                },

                setDomNodeChildren: function(domNode, childNodes) {
                    ko.utils.emptyDomNode(domNode);
                    if (childNodes) {
                        for (var i = 0, j = childNodes.length; i < j; i++)
                            domNode.appendChild(childNodes[i]);
                    }
                },

                replaceDomNodes: function(nodeToReplaceOrNodeArray, newNodesArray) {
                    var nodesToReplaceArray = nodeToReplaceOrNodeArray.nodeType ? [nodeToReplaceOrNodeArray] : nodeToReplaceOrNodeArray;
                    if (nodesToReplaceArray.length > 0) {
                        var insertionPoint = nodesToReplaceArray[0];
                        var parent = insertionPoint.parentNode;
                        for (var i = 0, j = newNodesArray.length; i < j; i++)
                            parent.insertBefore(newNodesArray[i], insertionPoint);
                        for (var i = 0, j = nodesToReplaceArray.length; i < j; i++) {
                            ko.removeNode(nodesToReplaceArray[i]);
                        }
                    }
                },

                setOptionNodeSelectionState: function(optionNode, isSelected) {
                    // IE6 sometimes throws "unknown error" if you try to write to .selected directly, whereas Firefox struggles with setAttribute. Pick one based on browser.
                    if (navigator.userAgent.indexOf("MSIE 6") >= 0)
                        optionNode.setAttribute("selected", isSelected);
                    else
                        optionNode.selected = isSelected;
                },

                stringTrim: function(string) {
                    return (string || "").replace(stringTrimRegex, "");
                },

                stringTokenize: function(string, delimiter) {
                    var result = [];
                    var tokens = (string || "").split(delimiter);
                    for (var i = 0, j = tokens.length; i < j; i++) {
                        var trimmed = ko.utils.stringTrim(tokens[i]);
                        if (trimmed !== "")
                            result.push(trimmed);
                    }
                    return result;
                },

                stringStartsWith: function(string, startsWith) {
                    string = string || "";
                    if (startsWith.length > string.length)
                        return false;
                    return string.substring(0, startsWith.length) === startsWith;
                },

                buildEvalWithinScopeFunction: function(expression, scopeLevels) {
                    // Build the source for a function that evaluates "expression"
                    // For each scope variable, add an extra level of "with" nesting
                    // Example result: with(sc[1]) { with(sc[0]) { return (expression) } }
                    var functionBody = "return (" + expression + ")";
                    for (var i = 0; i < scopeLevels; i++) {
                        functionBody = "with(sc[" + i + "]) { " + functionBody + " } ";
                    }
                    return new Function("sc", functionBody);
                },

                domNodeIsContainedBy: function(node, containedByNode) {
                    if (containedByNode.compareDocumentPosition)
                        return (containedByNode.compareDocumentPosition(node) & 16) == 16;
                    while (node != null) {
                        if (node == containedByNode)
                            return true;
                        node = node.parentNode;
                    }
                    return false;
                },

                domNodeIsAttachedToDocument: function(node) {
                    return ko.utils.domNodeIsContainedBy(node, node.ownerDocument);
                },

                tagNameLower: function(element) {
                    // For HTML elements, tagName will always be upper case; for XHTML elements, it'll be lower case.
                    // Possible future optimization: If we know it's an element from an XHTML document (not HTML),
                    // we don't need to do the .toLowerCase() as it will always be lower case anyway.
                    return element && element.tagName && element.tagName.toLowerCase();
                },

                registerEventHandler: function(element, eventType, handler) {
                    var mustUseAttachEvent = ieVersion && eventsThatMustBeRegisteredUsingAttachEvent[eventType];
                    if (!mustUseAttachEvent && typeof jQuery != "undefined") {
                        if (isClickOnCheckableElement(element, eventType)) {
                            // For click events on checkboxes, jQuery interferes with the event handling in an awkward way:
                            // it toggles the element checked state *after* the click event handlers run, whereas native
                            // click events toggle the checked state *before* the event handler.
                            // Fix this by intecepting the handler and applying the correct checkedness before it runs.
                            var originalHandler = handler;
                            handler = function(event, eventData) {
                                var jQuerySuppliedCheckedState = this.checked;
                                if (eventData)
                                    this.checked = eventData.checkedStateBeforeEvent !== true;
                                originalHandler.call(this, event);
                                this.checked = jQuerySuppliedCheckedState; // Restore the state jQuery applied
                            };
                        }
                        jQuery(element)['bind'](eventType, handler);
                    } else if (!mustUseAttachEvent && typeof element.addEventListener == "function")
                        element.addEventListener(eventType, handler, false);
                    else if (typeof element.attachEvent != "undefined")
                        element.attachEvent("on" + eventType, function(event) {
                            handler.call(element, event);
                        });
                    else
                        throw new Error("Browser doesn't support addEventListener or attachEvent");
                },

                triggerEvent: function(element, eventType) {
                    if (!(element && element.nodeType))
                        throw new Error("element must be a DOM node when calling triggerEvent");

                    if (typeof jQuery != "undefined") {
                        var eventData = [];
                        if (isClickOnCheckableElement(element, eventType)) {
                            // Work around the jQuery "click events on checkboxes" issue described above by storing the original checked state before triggering the handler
                            eventData.push({ checkedStateBeforeEvent: element.checked });
                        }
                        jQuery(element)['trigger'](eventType, eventData);
                    } else if (typeof document.createEvent == "function") {
                        if (typeof element.dispatchEvent == "function") {
                            var eventCategory = knownEventTypesByEventName[eventType] || "HTMLEvents";
                            var event = document.createEvent(eventCategory);
                            event.initEvent(eventType, true, true, window, 0, 0, 0, 0, 0, false, false, false, false, 0, element);
                            element.dispatchEvent(event);
                        } else
                            throw new Error("The supplied element doesn't support dispatchEvent");
                    } else if (typeof element.fireEvent != "undefined") {
                        // Unlike other browsers, IE doesn't change the checked state of checkboxes/radiobuttons when you trigger their "click" event
                        // so to make it consistent, we'll do it manually here
                        if (isClickOnCheckableElement(element, eventType))
                            element.checked = element.checked !== true;
                        element.fireEvent("on" + eventType);
                    } else
                        throw new Error("Browser doesn't support triggering events");
                },

                unwrapObservable: function(value) {
                    return ko.isObservable(value) ? value() : value;
                },

                toggleDomNodeCssClass: function(node, className, shouldHaveClass) {
                    var currentClassNames = (node.className || "").split(/\s+/);
                    var hasClass = ko.utils.arrayIndexOf(currentClassNames, className) >= 0;

                    if (shouldHaveClass && !hasClass) {
                        node.className += (currentClassNames[0] ? " " : "") + className;
                    } else if (hasClass && !shouldHaveClass) {
                        var newClassName = "";
                        for (var i = 0; i < currentClassNames.length; i++)
                            if (currentClassNames[i] != className)
                                newClassName += currentClassNames[i] + " ";
                        node.className = ko.utils.stringTrim(newClassName);
                    }
                },

                setTextContent: function(element, textContent) {
                    var value = ko.utils.unwrapObservable(textContent);
                    if ((value === null) || (value === undefined))
                        value = "";

                    'innerText' in element ? element.innerText = value
                        : element.textContent = value;

                    if (ieVersion >= 9) {
                        // Believe it or not, this actually fixes an IE9 rendering bug
                        // (See https://github.com/SteveSanderson/knockout/issues/209)
                        element.style.display = element.style.display;
                    }
                },

                ensureSelectElementIsRenderedCorrectly: function(selectElement) {
                    // Workaround for IE9 rendering bug - it doesn't reliably display all the text in dynamically-added select boxes unless you force it to re-render by updating the width.
                    // (See https://github.com/SteveSanderson/knockout/issues/312, http://stackoverflow.com/questions/5908494/select-only-shows-first-char-of-selected-option)
                    if (ieVersion >= 9) {
                        var originalWidth = selectElement.style.width;
                        selectElement.style.width = 0;
                        selectElement.style.width = originalWidth;
                    }
                },

                range: function(min, max) {
                    min = ko.utils.unwrapObservable(min);
                    max = ko.utils.unwrapObservable(max);
                    var result = [];
                    for (var i = min; i <= max; i++)
                        result.push(i);
                    return result;
                },

                makeArray: function(arrayLikeObject) {
                    var result = [];
                    for (var i = 0, j = arrayLikeObject.length; i < j; i++) {
                        result.push(arrayLikeObject[i]);
                    }
                    ;
                    return result;
                },

                isIe6: isIe6,
                isIe7: isIe7,
                ieVersion: ieVersion,

                getFormFields: function(form, fieldName) {
                    var fields = ko.utils.makeArray(form.getElementsByTagName("input")).concat(ko.utils.makeArray(form.getElementsByTagName("textarea")));
                    var isMatchingField = (typeof fieldName == 'string')
                        ? function(field) { return field.name === fieldName; }
                        : function(field) { return fieldName.test(field.name); }; // Treat fieldName as regex or object containing predicate
                    var matches = [];
                    for (var i = fields.length - 1; i >= 0; i--) {
                        if (isMatchingField(fields[i]))
                            matches.push(fields[i]);
                    }
                    ;
                    return matches;
                },

                parseJson: function(jsonString) {
                    if (typeof jsonString == "string") {
                        jsonString = ko.utils.stringTrim(jsonString);
                        if (jsonString) {
                            if (window.JSON && window.JSON.parse) // Use native parsing where available
                                return window.JSON.parse(jsonString);
                            return (new Function("return " + jsonString))(); // Fallback on less safe parsing for older browsers
                        }
                    }
                    return null;
                },

                stringifyJson: function(data, replacer, space) { // replacer and space are optional
                    if ((typeof JSON == "undefined") || (typeof JSON.stringify == "undefined"))
                        throw new Error("Cannot find JSON.stringify(). Some browsers (e.g., IE < 8) don't support it natively, but you can overcome this by adding a script reference to json2.js, downloadable from http://www.json.org/json2.js");
                    return JSON.stringify(ko.utils.unwrapObservable(data), replacer, space);
                },

                postJson: function(urlOrForm, data, options) {
                    options = options || {};
                    var params = options['params'] || {};
                    var includeFields = options['includeFields'] || this.fieldsIncludedWithJsonPost;
                    var url = urlOrForm;

                    // If we were given a form, use its 'action' URL and pick out any requested field values
                    if ((typeof urlOrForm == 'object') && (ko.utils.tagNameLower(urlOrForm) === "form")) {
                        var originalForm = urlOrForm;
                        url = originalForm.action;
                        for (var i = includeFields.length - 1; i >= 0; i--) {
                            var fields = ko.utils.getFormFields(originalForm, includeFields[i]);
                            for (var j = fields.length - 1; j >= 0; j--)
                                params[fields[j].name] = fields[j].value;
                        }
                    }

                    data = ko.utils.unwrapObservable(data);
                    var form = document.createElement("form");
                    form.style.display = "none";
                    form.action = url;
                    form.method = "post";
                    for (var key in data) {
                        var input = document.createElement("input");
                        input.name = key;
                        input.value = ko.utils.stringifyJson(ko.utils.unwrapObservable(data[key]));
                        form.appendChild(input);
                    }
                    for (var key in params) {
                        var input = document.createElement("input");
                        input.name = key;
                        input.value = params[key];
                        form.appendChild(input);
                    }
                    document.body.appendChild(form);
                    options['submitter'] ? options['submitter'](form) : form.submit();
                    setTimeout(function() { form.parentNode.removeChild(form); }, 0);
                }
            };
        })();

        ko.exportSymbol('utils', ko.utils);
        ko.exportSymbol('utils.arrayForEach', ko.utils.arrayForEach);
        ko.exportSymbol('utils.arrayFirst', ko.utils.arrayFirst);
        ko.exportSymbol('utils.arrayFilter', ko.utils.arrayFilter);
        ko.exportSymbol('utils.arrayGetDistinctValues', ko.utils.arrayGetDistinctValues);
        ko.exportSymbol('utils.arrayIndexOf', ko.utils.arrayIndexOf);
        ko.exportSymbol('utils.arrayMap', ko.utils.arrayMap);
        ko.exportSymbol('utils.arrayPushAll', ko.utils.arrayPushAll);
        ko.exportSymbol('utils.arrayRemoveItem', ko.utils.arrayRemoveItem);
        ko.exportSymbol('utils.extend', ko.utils.extend);
        ko.exportSymbol('utils.fieldsIncludedWithJsonPost', ko.utils.fieldsIncludedWithJsonPost);
        ko.exportSymbol('utils.getFormFields', ko.utils.getFormFields);
        ko.exportSymbol('utils.postJson', ko.utils.postJson);
        ko.exportSymbol('utils.parseJson', ko.utils.parseJson);
        ko.exportSymbol('utils.registerEventHandler', ko.utils.registerEventHandler);
        ko.exportSymbol('utils.stringifyJson', ko.utils.stringifyJson);
        ko.exportSymbol('utils.range', ko.utils.range);
        ko.exportSymbol('utils.toggleDomNodeCssClass', ko.utils.toggleDomNodeCssClass);
        ko.exportSymbol('utils.triggerEvent', ko.utils.triggerEvent);
        ko.exportSymbol('utils.unwrapObservable', ko.utils.unwrapObservable);

        if (!Function.prototype['bind']) {
            // Function.prototype.bind is a standard part of ECMAScript 5th Edition (December 2009, http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-262.pdf)
            // In case the browser doesn't implement it natively, provide a JavaScript implementation. This implementation is based on the one in prototype.js
            Function.prototype['bind'] = function(object) {
                var originalFunction = this, args = Array.prototype.slice.call(arguments), object = args.shift();
                return function() {
                    return originalFunction.apply(object, args.concat(Array.prototype.slice.call(arguments)));
                };
            };
        }

        ko.utils.domData = new (function() {
            var uniqueId = 0;
            var dataStoreKeyExpandoPropertyName = "__ko__" + (new Date).getTime();
            var dataStore = {};
            return {
                get: function(node, key) {
                    var allDataForNode = ko.utils.domData.getAll(node, false);
                    return allDataForNode === undefined ? undefined : allDataForNode[key];
                },
                set: function(node, key, value) {
                    if (value === undefined) {
                        // Make sure we don't actually create a new domData key if we are actually deleting a value
                        if (ko.utils.domData.getAll(node, false) === undefined)
                            return;
                    }
                    var allDataForNode = ko.utils.domData.getAll(node, true);
                    allDataForNode[key] = value;
                },
                getAll: function(node, createIfNotFound) {
                    var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
                    var hasExistingDataStore = dataStoreKey && (dataStoreKey !== "null");
                    if (!hasExistingDataStore) {
                        if (!createIfNotFound)
                            return undefined;
                        dataStoreKey = node[dataStoreKeyExpandoPropertyName] = "ko" + uniqueId++;
                        dataStore[dataStoreKey] = {};
                    }
                    return dataStore[dataStoreKey];
                },
                clear: function(node) {
                    var dataStoreKey = node[dataStoreKeyExpandoPropertyName];
                    if (dataStoreKey) {
                        delete dataStore[dataStoreKey];
                        node[dataStoreKeyExpandoPropertyName] = null;
                    }
                }
            };
        })();

        ko.exportSymbol('utils.domData', ko.utils.domData);
        ko.exportSymbol('utils.domData.clear', ko.utils.domData.clear); // Exporting only so specs can clear up after themselves fully

        ko.utils.domNodeDisposal = new (function() {
            var domDataKey = "__ko_domNodeDisposal__" + (new Date).getTime();
            var cleanableNodeTypes = { 1: true, 8: true, 9: true }; // Element, Comment, Document
            var cleanableNodeTypesWithDescendants = { 1: true, 9: true }; // Element, Document

            function getDisposeCallbacksCollection(node, createIfNotFound) {
                var allDisposeCallbacks = ko.utils.domData.get(node, domDataKey);
                if ((allDisposeCallbacks === undefined) && createIfNotFound) {
                    allDisposeCallbacks = [];
                    ko.utils.domData.set(node, domDataKey, allDisposeCallbacks);
                }
                return allDisposeCallbacks;
            }

            function destroyCallbacksCollection(node) {
                ko.utils.domData.set(node, domDataKey, undefined);
            }

            function cleanSingleNode(node) {
                // Run all the dispose callbacks
                var callbacks = getDisposeCallbacksCollection(node, false);
                if (callbacks) {
                    callbacks = callbacks.slice(0); // Clone, as the array may be modified during iteration (typically, callbacks will remove themselves)
                    for (var i = 0; i < callbacks.length; i++)
                        callbacks[i](node);
                }

                // Also erase the DOM data
                ko.utils.domData.clear(node);

                // Special support for jQuery here because it's so commonly used.
                // Many jQuery plugins (including jquery.tmpl) store data using jQuery's equivalent of domData
                // so notify it to tear down any resources associated with the node & descendants here.
                if ((typeof jQuery == "function") && (typeof jQuery['cleanData'] == "function"))
                    jQuery['cleanData']([node]);

                // Also clear any immediate-child comment nodes, as these wouldn't have been found by
                // node.getElementsByTagName("*") in cleanNode() (comment nodes aren't elements)
                if (cleanableNodeTypesWithDescendants[node.nodeType])
                    cleanImmediateCommentTypeChildren(node);
            }

            function cleanImmediateCommentTypeChildren(nodeWithChildren) {
                var child, nextChild = nodeWithChildren.firstChild;
                while (child = nextChild) {
                    nextChild = child.nextSibling;
                    if (child.nodeType === 8)
                        cleanSingleNode(child);
                }
            }

            return {
                addDisposeCallback: function(node, callback) {
                    if (typeof callback != "function")
                        throw new Error("Callback must be a function");
                    getDisposeCallbacksCollection(node, true).push(callback);
                },

                removeDisposeCallback: function(node, callback) {
                    var callbacksCollection = getDisposeCallbacksCollection(node, false);
                    if (callbacksCollection) {
                        ko.utils.arrayRemoveItem(callbacksCollection, callback);
                        if (callbacksCollection.length == 0)
                            destroyCallbacksCollection(node);
                    }
                },

                cleanNode: function(node) {
                    // First clean this node, where applicable
                    if (cleanableNodeTypes[node.nodeType]) {
                        cleanSingleNode(node);

                        // ... then its descendants, where applicable
                        if (cleanableNodeTypesWithDescendants[node.nodeType]) {
                            // Clone the descendants list in case it changes during iteration
                            var descendants = [];
                            ko.utils.arrayPushAll(descendants, node.getElementsByTagName("*"));
                            for (var i = 0, j = descendants.length; i < j; i++)
                                cleanSingleNode(descendants[i]);
                        }
                    }
                },

                removeNode: function(node) {
                    ko.cleanNode(node);
                    if (node.parentNode)
                        node.parentNode.removeChild(node);
                }
            };
        })();
        ko.cleanNode = ko.utils.domNodeDisposal.cleanNode; // Shorthand name for convenience
        ko.removeNode = ko.utils.domNodeDisposal.removeNode; // Shorthand name for convenience
        ko.exportSymbol('cleanNode', ko.cleanNode);
        ko.exportSymbol('removeNode', ko.removeNode);
        ko.exportSymbol('utils.domNodeDisposal', ko.utils.domNodeDisposal);
        ko.exportSymbol('utils.domNodeDisposal.addDisposeCallback', ko.utils.domNodeDisposal.addDisposeCallback);
        ko.exportSymbol('utils.domNodeDisposal.removeDisposeCallback', ko.utils.domNodeDisposal.removeDisposeCallback);
        (function() {
            var leadingCommentRegex = /^(\s*)<!--(.*?)-->/;

            function simpleHtmlParse(html) {
                // Based on jQuery's "clean" function, but only accounting for table-related elements.
                // If you have referenced jQuery, this won't be used anyway - KO will use jQuery's "clean" function directly

                // Note that there's still an issue in IE < 9 whereby it will discard comment nodes that are the first child of
                // a descendant node. For example: "<div><!-- mycomment -->abc</div>" will get parsed as "<div>abc</div>"
                // This won't affect anyone who has referenced jQuery, and there's always the workaround of inserting a dummy node
                // (possibly a text node) in front of the comment. So, KO does not attempt to workaround this IE issue automatically at present.

                // Trim whitespace, otherwise indexOf won't work as expected
                var tags = ko.utils.stringTrim(html).toLowerCase(), div = document.createElement("div");

                // Finds the first match from the left column, and returns the corresponding "wrap" data from the right column
                var wrap = tags.match(/^<(thead|tbody|tfoot)/) && [1, "<table>", "</table>"] ||
                    !tags.indexOf("<tr") && [2, "<table><tbody>", "</tbody></table>"] ||
                    (!tags.indexOf("<td") || !tags.indexOf("<th")) && [3, "<table><tbody><tr>", "</tr></tbody></table>"] ||
                    /* anything else */                                 [0, "", ""];

                // Go to html and back, then peel off extra wrappers
                // Note that we always prefix with some dummy text, because otherwise, IE<9 will strip out leading comment nodes in descendants. Total madness.
                var markup = "ignored<div>" + wrap[1] + html + wrap[2] + "</div>";
                if (typeof window['innerShiv'] == "function") {
                    div.appendChild(window['innerShiv'](markup));
                } else {
                    div.innerHTML = markup;
                }

                // Move to the right depth
                while (wrap[0]--)
                    div = div.lastChild;

                return ko.utils.makeArray(div.lastChild.childNodes);
            }

            function jQueryHtmlParse(html) {
                var elems = jQuery['clean']([html]);

                // As of jQuery 1.7.1, jQuery parses the HTML by appending it to some dummy parent nodes held in an in-memory document fragment.
                // Unfortunately, it never clears the dummy parent nodes from the document fragment, so it leaks memory over time.
                // Fix this by finding the top-most dummy parent element, and detaching it from its owner fragment.
                if (elems && elems[0]) {
                    // Find the top-most parent element that's a direct child of a document fragment
                    var elem = elems[0];
                    while (elem.parentNode && elem.parentNode.nodeType !== 11 /* i.e., DocumentFragment */)
                        elem = elem.parentNode;
                    // ... then detach it
                    if (elem.parentNode)
                        elem.parentNode.removeChild(elem);
                }

                return elems;
            }

            ko.utils.parseHtmlFragment = function(html) {
                return typeof jQuery != 'undefined' ? jQueryHtmlParse(html)   // As below, benefit from jQuery's optimisations where possible
                    : simpleHtmlParse(html); // ... otherwise, this simple logic will do in most common cases.
            };

            ko.utils.setHtml = function(node, html) {
                ko.utils.emptyDomNode(node);

                if ((html !== null) && (html !== undefined)) {
                    if (typeof html != 'string')
                        html = html.toString();

                    // jQuery contains a lot of sophisticated code to parse arbitrary HTML fragments,
                    // for example <tr> elements which are not normally allowed to exist on their own.
                    // If you've referenced jQuery we'll use that rather than duplicating its code.
                    if (typeof jQuery != 'undefined') {
                        jQuery(node)['html'](html);
                    } else {
                        // ... otherwise, use KO's own parsing logic.
                        var parsedNodes = ko.utils.parseHtmlFragment(html);
                        for (var i = 0; i < parsedNodes.length; i++)
                            node.appendChild(parsedNodes[i]);
                    }
                }
            };
        })();

        ko.exportSymbol('utils.parseHtmlFragment', ko.utils.parseHtmlFragment);
        ko.exportSymbol('utils.setHtml', ko.utils.setHtml);

        ko.memoization = (function() {
            var memos = {};

            function randomMax8HexChars() {
                return (((1 + Math.random()) * 0x100000000) | 0).toString(16).substring(1);
            }

            function generateRandomId() {
                return randomMax8HexChars() + randomMax8HexChars();
            }

            function findMemoNodes(rootNode, appendToArray) {
                if (!rootNode)
                    return;
                if (rootNode.nodeType == 8) {
                    var memoId = ko.memoization.parseMemoText(rootNode.nodeValue);
                    if (memoId != null)
                        appendToArray.push({ domNode: rootNode, memoId: memoId });
                } else if (rootNode.nodeType == 1) {
                    for (var i = 0, childNodes = rootNode.childNodes, j = childNodes.length; i < j; i++)
                        findMemoNodes(childNodes[i], appendToArray);
                }
            }

            return {
                memoize: function(callback) {
                    if (typeof callback != "function")
                        throw new Error("You can only pass a function to ko.memoization.memoize()");
                    var memoId = generateRandomId();
                    memos[memoId] = callback;
                    return "<!--[ko_memo:" + memoId + "]-->";
                },

                unmemoize: function(memoId, callbackParams) {
                    var callback = memos[memoId];
                    if (callback === undefined)
                        throw new Error("Couldn't find any memo with ID " + memoId + ". Perhaps it's already been unmemoized.");
                    try {
                        callback.apply(null, callbackParams || []);
                        return true;
                    } finally {
                        delete memos[memoId];
                    }
                },

                unmemoizeDomNodeAndDescendants: function(domNode, extraCallbackParamsArray) {
                    var memos = [];
                    findMemoNodes(domNode, memos);
                    for (var i = 0, j = memos.length; i < j; i++) {
                        var node = memos[i].domNode;
                        var combinedParams = [node];
                        if (extraCallbackParamsArray)
                            ko.utils.arrayPushAll(combinedParams, extraCallbackParamsArray);
                        ko.memoization.unmemoize(memos[i].memoId, combinedParams);
                        node.nodeValue = ""; // Neuter this node so we don't try to unmemoize it again
                        if (node.parentNode)
                            node.parentNode.removeChild(node); // If possible, erase it totally (not always possible - someone else might just hold a reference to it then call unmemoizeDomNodeAndDescendants again)
                    }
                },

                parseMemoText: function(memoText) {
                    var match = memoText.match(/^\[ko_memo\:(.*?)\]$/);
                    return match ? match[1] : null;
                }
            };
        })();

        ko.exportSymbol('memoization', ko.memoization);
        ko.exportSymbol('memoization.memoize', ko.memoization.memoize);
        ko.exportSymbol('memoization.unmemoize', ko.memoization.unmemoize);
        ko.exportSymbol('memoization.parseMemoText', ko.memoization.parseMemoText);
        ko.exportSymbol('memoization.unmemoizeDomNodeAndDescendants', ko.memoization.unmemoizeDomNodeAndDescendants);
        ko.extenders = {
            'throttle': function(target, timeout) {
                // Throttling means two things:

                // (1) For dependent observables, we throttle *evaluations* so that, no matter how fast its dependencies
                //     notify updates, the target doesn't re-evaluate (and hence doesn't notify) faster than a certain rate
                target['throttleEvaluation'] = timeout;

                // (2) For writable targets (observables, or writable dependent observables), we throttle *writes*
                //     so the target cannot change value synchronously or faster than a certain rate
                var writeTimeoutInstance = null;
                return ko.dependentObservable({
                    'read': target,
                    'write': function(value) {
                        clearTimeout(writeTimeoutInstance);
                        writeTimeoutInstance = setTimeout(function() {
                            target(value);
                        }, timeout);
                    }
                });
            },

            'notify': function(target, notifyWhen) {
                target["equalityComparer"] = notifyWhen == "always"
                    ? function() { return false; } // Treat all values as not equal
                    : ko.observable["fn"]["equalityComparer"];
                return target;
            }
        };

        function applyExtenders(requestedExtenders) {
            var target = this;
            if (requestedExtenders) {
                for (var key in requestedExtenders) {
                    var extenderHandler = ko.extenders[key];
                    if (typeof extenderHandler == 'function') {
                        target = extenderHandler(target, requestedExtenders[key]);
                    }
                }
            }
            return target;
        }

        ko.exportSymbol('extenders', ko.extenders);

        ko.subscription = function(target, callback, disposeCallback) {
            this.target = target;
            this.callback = callback;
            this.disposeCallback = disposeCallback;
            ko.exportProperty(this, 'dispose', this.dispose);
        };
        ko.subscription.prototype.dispose = function() {
            this.isDisposed = true;
            this.disposeCallback();
        };

        ko.subscribable = function() {
            this._subscriptions = {};

            ko.utils.extend(this, ko.subscribable['fn']);
            ko.exportProperty(this, 'subscribe', this.subscribe);
            ko.exportProperty(this, 'extend', this.extend);
            ko.exportProperty(this, 'getSubscriptionsCount', this.getSubscriptionsCount);
        };
        var defaultEvent = "change";

        ko.subscribable['fn'] = {
            subscribe: function(callback, callbackTarget, event) {
                event = event || defaultEvent;
                var boundCallback = callbackTarget ? callback.bind(callbackTarget) : callback;

                var subscription = new ko.subscription(this, boundCallback, function() {
                    ko.utils.arrayRemoveItem(this._subscriptions[event], subscription);
                }.bind(this));

                if (!this._subscriptions[event])
                    this._subscriptions[event] = [];
                this._subscriptions[event].push(subscription);
                return subscription;
            },

            "notifySubscribers": function(valueToNotify, event) {
                event = event || defaultEvent;
                if (this._subscriptions[event]) {
                    ko.utils.arrayForEach(this._subscriptions[event].slice(0), function(subscription) {
                        // In case a subscription was disposed during the arrayForEach cycle, check
                        // for isDisposed on each subscription before invoking its callback
                        if (subscription && (subscription.isDisposed !== true))
                            subscription.callback(valueToNotify);
                    });
                }
            },

            getSubscriptionsCount: function() {
                var total = 0;
                for (var eventName in this._subscriptions) {
                    if (this._subscriptions.hasOwnProperty(eventName))
                        total += this._subscriptions[eventName].length;
                }
                return total;
            },

            extend: applyExtenders
        };


        ko.isSubscribable = function(instance) {
            return typeof instance.subscribe == "function" && typeof instance["notifySubscribers"] == "function";
        };

        ko.exportSymbol('subscribable', ko.subscribable);
        ko.exportSymbol('isSubscribable', ko.isSubscribable);

        ko.dependencyDetection = (function() {
            var _frames = [];

            return {
                begin: function(callback) {
                    _frames.push({ callback: callback, distinctDependencies: [] });
                },

                end: function() {
                    _frames.pop();
                },

                registerDependency: function(subscribable) {
                    if (!ko.isSubscribable(subscribable))
                        throw new Error("Only subscribable things can act as dependencies");
                    if (_frames.length > 0) {
                        var topFrame = _frames[_frames.length - 1];
                        if (ko.utils.arrayIndexOf(topFrame.distinctDependencies, subscribable) >= 0)
                            return;
                        topFrame.distinctDependencies.push(subscribable);
                        topFrame.callback(subscribable);
                    }
                }
            };
        })();
        var primitiveTypes = { 'undefined': true, 'boolean': true, 'number': true, 'string': true };

        ko.observable = function(initialValue) {
            var _latestValue = initialValue;

            function observable() {
                if (arguments.length > 0) {
                    // Write

                    // Ignore writes if the value hasn't changed
                    if ((!observable['equalityComparer']) || !observable['equalityComparer'](_latestValue, arguments[0])) {
                        observable.valueWillMutate();
                        _latestValue = arguments[0];
                        if (DEBUG) observable._latestValue = _latestValue;
                        observable.valueHasMutated();
                    }
                    return this; // Permits chained assignments
                } else {
                    // Read
                    ko.dependencyDetection.registerDependency(observable); // The caller only needs to be notified of changes if they did a "read" operation
                    return _latestValue;
                }
            }

            if (DEBUG) observable._latestValue = _latestValue;
            ko.subscribable.call(observable);
            observable.valueHasMutated = function() { observable["notifySubscribers"](_latestValue); };
            observable.valueWillMutate = function() { observable["notifySubscribers"](_latestValue, "beforeChange"); };
            ko.utils.extend(observable, ko.observable['fn']);

            ko.exportProperty(observable, "valueHasMutated", observable.valueHasMutated);
            ko.exportProperty(observable, "valueWillMutate", observable.valueWillMutate);

            return observable;
        };
        ko.observable['fn'] = {
            "equalityComparer": function valuesArePrimitiveAndEqual(a, b) {
                var oldValueIsPrimitive = (a === null) || (typeof(a) in primitiveTypes);
                return oldValueIsPrimitive ? (a === b) : false;
            }
        };

        var protoProperty = ko.observable.protoProperty = "__ko_proto__";
        ko.observable['fn'][protoProperty] = ko.observable;

        ko.hasPrototype = function(instance, prototype) {
            if ((instance === null) || (instance === undefined) || (instance[protoProperty] === undefined)) return false;
            if (instance[protoProperty] === prototype) return true;
            return ko.hasPrototype(instance[protoProperty], prototype); // Walk the prototype chain
        };

        ko.isObservable = function(instance) {
            return ko.hasPrototype(instance, ko.observable);
        };
        ko.isWriteableObservable = function(instance) {
            // Observable
            if ((typeof instance == "function") && instance[protoProperty] === ko.observable)
                return true;
            // Writeable dependent observable
            if ((typeof instance == "function") && (instance[protoProperty] === ko.dependentObservable) && (instance.hasWriteFunction))
                return true;
            // Anything else
            return false;
        };
        ko.exportSymbol('observable', ko.observable);
        ko.exportSymbol('isObservable', ko.isObservable);
        ko.exportSymbol('isWriteableObservable', ko.isWriteableObservable);
        ko.observableArray = function(initialValues) {
            if (arguments.length == 0) {
                // Zero-parameter constructor initializes to empty array
                initialValues = [];
            }
            if ((initialValues !== null) && (initialValues !== undefined) && !('length' in initialValues))
                throw new Error("The argument passed when initializing an observable array must be an array, or null, or undefined.");

            var result = ko.observable(initialValues);
            ko.utils.extend(result, ko.observableArray['fn']);
            return result;
        };
        ko.observableArray['fn'] = {
            'remove': function(valueOrPredicate) {
                var underlyingArray = this();
                var removedValues = [];
                var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function(value) { return value === valueOrPredicate; };
                for (var i = 0; i < underlyingArray.length; i++) {
                    var value = underlyingArray[i];
                    if (predicate(value)) {
                        if (removedValues.length === 0) {
                            this.valueWillMutate();
                        }
                        removedValues.push(value);
                        underlyingArray.splice(i, 1);
                        i--;
                    }
                }
                if (removedValues.length) {
                    this.valueHasMutated();
                }
                return removedValues;
            },

            'removeAll': function(arrayOfValues) {
                // If you passed zero args, we remove everything
                if (arrayOfValues === undefined) {
                    var underlyingArray = this();
                    var allValues = underlyingArray.slice(0);
                    this.valueWillMutate();
                    underlyingArray.splice(0, underlyingArray.length);
                    this.valueHasMutated();
                    return allValues;
                }
                // If you passed an arg, we interpret it as an array of entries to remove
                if (!arrayOfValues)
                    return [];
                return this['remove'](function(value) {
                    return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
                });
            },

            'destroy': function(valueOrPredicate) {
                var underlyingArray = this();
                var predicate = typeof valueOrPredicate == "function" ? valueOrPredicate : function(value) { return value === valueOrPredicate; };
                this.valueWillMutate();
                for (var i = underlyingArray.length - 1; i >= 0; i--) {
                    var value = underlyingArray[i];
                    if (predicate(value))
                        underlyingArray[i]["_destroy"] = true;
                }
                this.valueHasMutated();
            },

            'destroyAll': function(arrayOfValues) {
                // If you passed zero args, we destroy everything
                if (arrayOfValues === undefined)
                    return this['destroy'](function() { return true; });

                // If you passed an arg, we interpret it as an array of entries to destroy
                if (!arrayOfValues)
                    return [];
                return this['destroy'](function(value) {
                    return ko.utils.arrayIndexOf(arrayOfValues, value) >= 0;
                });
            },

            'indexOf': function(item) {
                var underlyingArray = this();
                return ko.utils.arrayIndexOf(underlyingArray, item);
            },

            'replace': function(oldItem, newItem) {
                var index = this['indexOf'](oldItem);
                if (index >= 0) {
                    this.valueWillMutate();
                    this()[index] = newItem;
                    this.valueHasMutated();
                }
            }
        }; // Populate ko.observableArray.fn with read/write functions from native arrays
        ko.utils.arrayForEach(["pop", "push", "reverse", "shift", "sort", "splice", "unshift"], function(methodName) {
            ko.observableArray['fn'][methodName] = function() {
                var underlyingArray = this();
                this.valueWillMutate();
                var methodCallResult = underlyingArray[methodName].apply(underlyingArray, arguments);
                this.valueHasMutated();
                return methodCallResult;
            };
        });

// Populate ko.observableArray.fn with read-only functions from native arrays
        ko.utils.arrayForEach(["slice"], function(methodName) {
            ko.observableArray['fn'][methodName] = function() {
                var underlyingArray = this();
                return underlyingArray[methodName].apply(underlyingArray, arguments);
            };
        });

        ko.exportSymbol('observableArray', ko.observableArray);
        ko.dependentObservable = function(evaluatorFunctionOrOptions, evaluatorFunctionTarget, options) {
            var _latestValue,
                _hasBeenEvaluated = false,
                _isBeingEvaluated = false,
                readFunction = evaluatorFunctionOrOptions;

            if (readFunction && typeof readFunction == "object") {
                // Single-parameter syntax - everything is on this "options" param
                options = readFunction;
                readFunction = options["read"];
            } else {
                // Multi-parameter syntax - construct the options according to the params passed
                options = options || {};
                if (!readFunction)
                    readFunction = options["read"];
            }
            // By here, "options" is always non-null
            if (typeof readFunction != "function")
                throw new Error("Pass a function that returns the value of the ko.computed");

            var writeFunction = options["write"];
            if (!evaluatorFunctionTarget)
                evaluatorFunctionTarget = options["owner"];

            var _subscriptionsToDependencies = [];

            function disposeAllSubscriptionsToDependencies() {
                ko.utils.arrayForEach(_subscriptionsToDependencies, function(subscription) {
                    subscription.dispose();
                });
                _subscriptionsToDependencies = [];
            }

            var dispose = disposeAllSubscriptionsToDependencies;

            // Build "disposeWhenNodeIsRemoved" and "disposeWhenNodeIsRemovedCallback" option values
            // (Note: "disposeWhenNodeIsRemoved" option both proactively disposes as soon as the node is removed using ko.removeNode(),
            // plus adds a "disposeWhen" callback that, on each evaluation, disposes if the node was removed by some other means.)
            var disposeWhenNodeIsRemoved = (typeof options["disposeWhenNodeIsRemoved"] == "object") ? options["disposeWhenNodeIsRemoved"] : null;
            var disposeWhen = options["disposeWhen"] || function() { return false; };
            if (disposeWhenNodeIsRemoved) {
                dispose = function() {
                    ko.utils.domNodeDisposal.removeDisposeCallback(disposeWhenNodeIsRemoved, arguments.callee);
                    disposeAllSubscriptionsToDependencies();
                };
                ko.utils.domNodeDisposal.addDisposeCallback(disposeWhenNodeIsRemoved, dispose);
                var existingDisposeWhenFunction = disposeWhen;
                disposeWhen = function() {
                    return !ko.utils.domNodeIsAttachedToDocument(disposeWhenNodeIsRemoved) || existingDisposeWhenFunction();
                };
            }

            var evaluationTimeoutInstance = null;

            function evaluatePossiblyAsync() {
                var throttleEvaluationTimeout = dependentObservable['throttleEvaluation'];
                if (throttleEvaluationTimeout && throttleEvaluationTimeout >= 0) {
                    clearTimeout(evaluationTimeoutInstance);
                    evaluationTimeoutInstance = setTimeout(evaluateImmediate, throttleEvaluationTimeout);
                } else
                    evaluateImmediate();
            }

            function evaluateImmediate() {
                if (_isBeingEvaluated) {
                    // If the evaluation of a ko.computed causes side effects, it's possible that it will trigger its own re-evaluation.
                    // This is not desirable (it's hard for a developer to realise a chain of dependencies might cause this, and they almost
                    // certainly didn't intend infinite re-evaluations). So, for predictability, we simply prevent ko.computeds from causing
                    // their own re-evaluation. Further discussion at https://github.com/SteveSanderson/knockout/pull/387
                    return;
                }

                // Don't dispose on first evaluation, because the "disposeWhen" callback might
                // e.g., dispose when the associated DOM element isn't in the doc, and it's not
                // going to be in the doc until *after* the first evaluation
                if (_hasBeenEvaluated && disposeWhen()) {
                    dispose();
                    return;
                }

                _isBeingEvaluated = true;
                try {
                    // Initially, we assume that none of the subscriptions are still being used (i.e., all are candidates for disposal).
                    // Then, during evaluation, we cross off any that are in fact still being used.
                    var disposalCandidates = ko.utils.arrayMap(_subscriptionsToDependencies, function(item) { return item.target; });

                    ko.dependencyDetection.begin(function(subscribable) {
                        var inOld;
                        if ((inOld = ko.utils.arrayIndexOf(disposalCandidates, subscribable)) >= 0)
                            disposalCandidates[inOld] = undefined; // Don't want to dispose this subscription, as it's still being used
                        else
                            _subscriptionsToDependencies.push(subscribable.subscribe(evaluatePossiblyAsync)); // Brand new subscription - add it
                    });

                    var newValue = readFunction.call(evaluatorFunctionTarget);

                    // For each subscription no longer being used, remove it from the active subscriptions list and dispose it
                    for (var i = disposalCandidates.length - 1; i >= 0; i--) {
                        if (disposalCandidates[i])
                            _subscriptionsToDependencies.splice(i, 1)[0].dispose();
                    }
                    _hasBeenEvaluated = true;

                    dependentObservable["notifySubscribers"](_latestValue, "beforeChange");
                    _latestValue = newValue;
                    if (DEBUG) dependentObservable._latestValue = _latestValue;
                } finally {
                    ko.dependencyDetection.end();
                }

                dependentObservable["notifySubscribers"](_latestValue);
                _isBeingEvaluated = false;

            }

            function dependentObservable() {
                if (arguments.length > 0) {
                    set.apply(dependentObservable, arguments);
                } else {
                    return get();
                }
            }

            function set() {
                if (typeof writeFunction === "function") {
                    // Writing a value
                    writeFunction.apply(evaluatorFunctionTarget, arguments);
                } else {
                    throw new Error("Cannot write a value to a ko.computed unless you specify a 'write' option. If you wish to read the current value, don't pass any parameters.");
                }
            }

            function get() {
                // Reading the value
                if (!_hasBeenEvaluated)
                    evaluateImmediate();
                ko.dependencyDetection.registerDependency(dependentObservable);
                return _latestValue;
            }

            dependentObservable.getDependenciesCount = function() { return _subscriptionsToDependencies.length; };
            dependentObservable.hasWriteFunction = typeof options["write"] === "function";
            dependentObservable.dispose = function() { dispose(); };

            ko.subscribable.call(dependentObservable);
            ko.utils.extend(dependentObservable, ko.dependentObservable['fn']);

            if (options['deferEvaluation'] !== true)
                evaluateImmediate();

            ko.exportProperty(dependentObservable, 'dispose', dependentObservable.dispose);
            ko.exportProperty(dependentObservable, 'getDependenciesCount', dependentObservable.getDependenciesCount);

            return dependentObservable;
        };

        ko.isComputed = function(instance) {
            return ko.hasPrototype(instance, ko.dependentObservable);
        };

        var protoProp = ko.observable.protoProperty; // == "__ko_proto__"
        ko.dependentObservable[protoProp] = ko.observable;

        ko.dependentObservable['fn'] = {};
        ko.dependentObservable['fn'][protoProp] = ko.dependentObservable;

        ko.exportSymbol('dependentObservable', ko.dependentObservable);
        ko.exportSymbol('computed', ko.dependentObservable); // Make "ko.computed" an alias for "ko.dependentObservable"
        ko.exportSymbol('isComputed', ko.isComputed);

        (function() {
            var maxNestedObservableDepth = 10; // Escape the (unlikely) pathalogical case where an observable's current value is itself (or similar reference cycle)

            ko.toJS = function(rootObject) {
                if (arguments.length == 0)
                    throw new Error("When calling ko.toJS, pass the object you want to convert.");

                // We just unwrap everything at every level in the object graph
                return mapJsObjectGraph(rootObject, function(valueToMap) {
                    // Loop because an observable's value might in turn be another observable wrapper
                    for (var i = 0; ko.isObservable(valueToMap) && (i < maxNestedObservableDepth); i++)
                        valueToMap = valueToMap();
                    return valueToMap;
                });
            };

            ko.toJSON = function(rootObject, replacer, space) { // replacer and space are optional
                var plainJavaScriptObject = ko.toJS(rootObject);
                return ko.utils.stringifyJson(plainJavaScriptObject, replacer, space);
            };

            function mapJsObjectGraph(rootObject, mapInputCallback, visitedObjects) {
                visitedObjects = visitedObjects || new objectLookup();

                rootObject = mapInputCallback(rootObject);
                var canHaveProperties = (typeof rootObject == "object") && (rootObject !== null) && (rootObject !== undefined) && (!(rootObject instanceof Date));
                if (!canHaveProperties)
                    return rootObject;

                var outputProperties = rootObject instanceof Array ? [] : {};
                visitedObjects.save(rootObject, outputProperties);

                visitPropertiesOrArrayEntries(rootObject, function(indexer) {
                    var propertyValue = mapInputCallback(rootObject[indexer]);

                    switch (typeof propertyValue) {
                    case "boolean":
                    case "number":
                    case "string":
                    case "function":
                        outputProperties[indexer] = propertyValue;
                        break;
                    case "object":
                    case "undefined":
                        var previouslyMappedValue = visitedObjects.get(propertyValue);
                        outputProperties[indexer] = (previouslyMappedValue !== undefined)
                            ? previouslyMappedValue
                            : mapJsObjectGraph(propertyValue, mapInputCallback, visitedObjects);
                        break;
                    }
                });

                return outputProperties;
            }

            function visitPropertiesOrArrayEntries(rootObject, visitorCallback) {
                if (rootObject instanceof Array) {
                    for (var i = 0; i < rootObject.length; i++)
                        visitorCallback(i);

                    // For arrays, also respect toJSON property for custom mappings (fixes #278)
                    if (typeof rootObject['toJSON'] == 'function')
                        visitorCallback('toJSON');
                } else {
                    for (var propertyName in rootObject)
                        visitorCallback(propertyName);
                }
            }

            ;

            function objectLookup() {
                var keys = [];
                var values = [];
                this.save = function(key, value) {
                    var existingIndex = ko.utils.arrayIndexOf(keys, key);
                    if (existingIndex >= 0)
                        values[existingIndex] = value;
                    else {
                        keys.push(key);
                        values.push(value);
                    }
                };
                this.get = function(key) {
                    var existingIndex = ko.utils.arrayIndexOf(keys, key);
                    return (existingIndex >= 0) ? values[existingIndex] : undefined;
                };
            }

            ;
        })();

        ko.exportSymbol('toJS', ko.toJS);
        ko.exportSymbol('toJSON', ko.toJSON);
        (function() {
            var hasDomDataExpandoProperty = '__ko__hasDomDataOptionValue__';

            // Normally, SELECT elements and their OPTIONs can only take value of type 'string' (because the values
            // are stored on DOM attributes). ko.selectExtensions provides a way for SELECTs/OPTIONs to have values
            // that are arbitrary objects. This is very convenient when implementing things like cascading dropdowns.
            ko.selectExtensions = {
                readValue: function(element) {
                    switch (ko.utils.tagNameLower(element)) {
                    case 'option':
                        if (element[hasDomDataExpandoProperty] === true)
                            return ko.utils.domData.get(element, ko.bindingHandlers.options.optionValueDomDataKey);
                        return element.getAttribute("value");
                    case 'select':
                        return element.selectedIndex >= 0 ? ko.selectExtensions.readValue(element.options[element.selectedIndex]) : undefined;
                    default:
                        return element.value;
                    }
                },

                writeValue: function(element, value) {
                    switch (ko.utils.tagNameLower(element)) {
                    case 'option':
                        switch (typeof value) {
                        case "string":
                            ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, undefined);
                            if (hasDomDataExpandoProperty in element) { // IE <= 8 throws errors if you delete non-existent properties from a DOM node
                                delete element[hasDomDataExpandoProperty];
                            }
                            element.value = value;
                            break;
                        default:
                            // Store arbitrary object using DomData
                            ko.utils.domData.set(element, ko.bindingHandlers.options.optionValueDomDataKey, value);
                            element[hasDomDataExpandoProperty] = true;

                            // Special treatment of numbers is just for backward compatibility. KO 1.2.1 wrote numerical values to element.value.
                            element.value = typeof value === "number" ? value : "";
                            break;
                        }
                        break;
                    case 'select':
                        for (var i = element.options.length - 1; i >= 0; i--) {
                            if (ko.selectExtensions.readValue(element.options[i]) == value) {
                                element.selectedIndex = i;
                                break;
                            }
                        }
                        break;
                    default:
                        if ((value === null) || (value === undefined))
                            value = "";
                        element.value = value;
                        break;
                    }
                }
            };
        })();

        ko.exportSymbol('selectExtensions', ko.selectExtensions);
        ko.exportSymbol('selectExtensions.readValue', ko.selectExtensions.readValue);
        ko.exportSymbol('selectExtensions.writeValue', ko.selectExtensions.writeValue);

        ko.jsonExpressionRewriting = (function() {
            var restoreCapturedTokensRegex = /\@ko_token_(\d+)\@/g;
            var javaScriptAssignmentTarget = /^[\_$a-z][\_$a-z0-9]*(\[.*?\])*(\.[\_$a-z][\_$a-z0-9]*(\[.*?\])*)*$/i;
            var javaScriptReservedWords = ["true", "false"];

            function restoreTokens(string, tokens) {
                var prevValue = null;
                while (string != prevValue) { // Keep restoring tokens until it no longer makes a difference (they may be nested)
                    prevValue = string;
                    string = string.replace(restoreCapturedTokensRegex, function(match, tokenIndex) {
                        return tokens[tokenIndex];
                    });
                }
                return string;
            }

            function isWriteableValue(expression) {
                if (ko.utils.arrayIndexOf(javaScriptReservedWords, ko.utils.stringTrim(expression).toLowerCase()) >= 0)
                    return false;
                return expression.match(javaScriptAssignmentTarget) !== null;
            }

            function ensureQuoted(key) {
                var trimmedKey = ko.utils.stringTrim(key);
                switch (trimmedKey.length && trimmedKey.charAt(0)) {
                case "'":
                case '"':
                    return key;
                default:
                    return "'" + trimmedKey + "'";
                }
            }

            return {
                bindingRewriteValidators: [],

                parseObjectLiteral: function(objectLiteralString) {
                    // A full tokeniser+lexer would add too much weight to this library, so here's a simple parser
                    // that is sufficient just to split an object literal string into a set of top-level key-value pairs

                    var str = ko.utils.stringTrim(objectLiteralString);
                    if (str.length < 3)
                        return [];
                    if (str.charAt(0) === "{")// Ignore any braces surrounding the whole object literal
                        str = str.substring(1, str.length - 1);

                    // Pull out any string literals and regex literals
                    var tokens = [];
                    var tokenStart = null, tokenEndChar;
                    for (var position = 0; position < str.length; position++) {
                        var c = str.charAt(position);
                        if (tokenStart === null) {
                            switch (c) {
                            case '"':
                            case "'":
                            case "/":
                                tokenStart = position;
                                tokenEndChar = c;
                                break;
                            }
                        } else if ((c == tokenEndChar) && (str.charAt(position - 1) !== "\\")) {
                            var token = str.substring(tokenStart, position + 1);
                            tokens.push(token);
                            var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                            str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                            position -= (token.length - replacement.length);
                            tokenStart = null;
                        }
                    }

                    // Next pull out balanced paren, brace, and bracket blocks
                    tokenStart = null;
                    tokenEndChar = null;
                    var tokenDepth = 0, tokenStartChar = null;
                    for (var position = 0; position < str.length; position++) {
                        var c = str.charAt(position);
                        if (tokenStart === null) {
                            switch (c) {
                            case "{":
                                tokenStart = position;
                                tokenStartChar = c;
                                tokenEndChar = "}";
                                break;
                            case "(":
                                tokenStart = position;
                                tokenStartChar = c;
                                tokenEndChar = ")";
                                break;
                            case "[":
                                tokenStart = position;
                                tokenStartChar = c;
                                tokenEndChar = "]";
                                break;
                            }
                        }

                        if (c === tokenStartChar)
                            tokenDepth++;
                        else if (c === tokenEndChar) {
                            tokenDepth--;
                            if (tokenDepth === 0) {
                                var token = str.substring(tokenStart, position + 1);
                                tokens.push(token);
                                var replacement = "@ko_token_" + (tokens.length - 1) + "@";
                                str = str.substring(0, tokenStart) + replacement + str.substring(position + 1);
                                position -= (token.length - replacement.length);
                                tokenStart = null;
                            }
                        }
                    }

                    // Now we can safely split on commas to get the key/value pairs
                    var result = [];
                    var keyValuePairs = str.split(",");
                    for (var i = 0, j = keyValuePairs.length; i < j; i++) {
                        var pair = keyValuePairs[i];
                        var colonPos = pair.indexOf(":");
                        if ((colonPos > 0) && (colonPos < pair.length - 1)) {
                            var key = pair.substring(0, colonPos);
                            var value = pair.substring(colonPos + 1);
                            result.push({ 'key': restoreTokens(key, tokens), 'value': restoreTokens(value, tokens) });
                        } else {
                            result.push({ 'unknown': restoreTokens(pair, tokens) });
                        }
                    }
                    return result;
                },

                insertPropertyAccessorsIntoJson: function(objectLiteralStringOrKeyValueArray) {
                    var keyValueArray = typeof objectLiteralStringOrKeyValueArray === "string"
                        ? ko.jsonExpressionRewriting.parseObjectLiteral(objectLiteralStringOrKeyValueArray)
                        : objectLiteralStringOrKeyValueArray;
                    var resultStrings = [], propertyAccessorResultStrings = [];

                    var keyValueEntry;
                    for (var i = 0; keyValueEntry = keyValueArray[i]; i++) {
                        if (resultStrings.length > 0)
                            resultStrings.push(",");

                        if (keyValueEntry['key']) {
                            var quotedKey = ensureQuoted(keyValueEntry['key']), val = keyValueEntry['value'];
                            resultStrings.push(quotedKey);
                            resultStrings.push(":");
                            resultStrings.push(val);

                            if (isWriteableValue(ko.utils.stringTrim(val))) {
                                if (propertyAccessorResultStrings.length > 0)
                                    propertyAccessorResultStrings.push(", ");
                                propertyAccessorResultStrings.push(quotedKey + " : function(__ko_value) { " + val + " = __ko_value; }");
                            }
                        } else if (keyValueEntry['unknown']) {
                            resultStrings.push(keyValueEntry['unknown']);
                        }
                    }

                    var combinedResult = resultStrings.join("");
                    if (propertyAccessorResultStrings.length > 0) {
                        var allPropertyAccessors = propertyAccessorResultStrings.join("");
                        combinedResult = combinedResult + ", '_ko_property_writers' : { " + allPropertyAccessors + " } ";
                    }

                    return combinedResult;
                },

                keyValueArrayContainsKey: function(keyValueArray, key) {
                    for (var i = 0; i < keyValueArray.length; i++)
                        if (ko.utils.stringTrim(keyValueArray[i]['key']) == key)
                            return true;
                    return false;
                },

                // Internal, private KO utility for updating model properties from within bindings
                // property:            If the property being updated is (or might be) an observable, pass it here
                //                      If it turns out to be a writable observable, it will be written to directly
                // allBindingsAccessor: All bindings in the current execution context.
                //                      This will be searched for a '_ko_property_writers' property in case you're writing to a non-observable
                // key:                 The key identifying the property to be written. Example: for { hasFocus: myValue }, write to 'myValue' by specifying the key 'hasFocus'
                // value:               The value to be written
                // checkIfDifferent:    If true, and if the property being written is a writable observable, the value will only be written if
                //                      it is !== existing value on that writable observable
                writeValueToProperty: function(property, allBindingsAccessor, key, value, checkIfDifferent) {
                    if (!property || !ko.isWriteableObservable(property)) {
                        var propWriters = allBindingsAccessor()['_ko_property_writers'];
                        if (propWriters && propWriters[key])
                            propWriters[key](value);
                    } else if (!checkIfDifferent || property() !== value) {
                        property(value);
                    }
                }
            };
        })();

        ko.exportSymbol('jsonExpressionRewriting', ko.jsonExpressionRewriting);
        ko.exportSymbol('jsonExpressionRewriting.bindingRewriteValidators', ko.jsonExpressionRewriting.bindingRewriteValidators);
        ko.exportSymbol('jsonExpressionRewriting.parseObjectLiteral', ko.jsonExpressionRewriting.parseObjectLiteral);
        ko.exportSymbol('jsonExpressionRewriting.insertPropertyAccessorsIntoJson', ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson);
        (function() {
            // "Virtual elements" is an abstraction on top of the usual DOM API which understands the notion that comment nodes
            // may be used to represent hierarchy (in addition to the DOM's natural hierarchy).
            // If you call the DOM-manipulating functions on ko.virtualElements, you will be able to read and write the state
            // of that virtual hierarchy
            //
            // The point of all this is to support containerless templates (e.g., <!-- ko foreach:someCollection -->blah<!-- /ko -->)
            // without having to scatter special cases all over the binding and templating code.

            // IE 9 cannot reliably read the "nodeValue" property of a comment node (see https://github.com/SteveSanderson/knockout/issues/186)
            // but it does give them a nonstandard alternative property called "text" that it can read reliably. Other browsers don't have that property.
            // So, use node.text where available, and node.nodeValue elsewhere
            var commentNodesHaveTextProperty = document.createComment("test").text === "<!--test-->";

            var startCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*ko\s+(.*\:.*)\s*-->$/ : /^\s*ko\s+(.*\:.*)\s*$/;
            var endCommentRegex = commentNodesHaveTextProperty ? /^<!--\s*\/ko\s*-->$/ : /^\s*\/ko\s*$/;
            var htmlTagsWithOptionallyClosingChildren = { 'ul': true, 'ol': true };

            function isStartComment(node) {
                return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(startCommentRegex);
            }

            function isEndComment(node) {
                return (node.nodeType == 8) && (commentNodesHaveTextProperty ? node.text : node.nodeValue).match(endCommentRegex);
            }

            function getVirtualChildren(startComment, allowUnbalanced) {
                var currentNode = startComment;
                var depth = 1;
                var children = [];
                while (currentNode = currentNode.nextSibling) {
                    if (isEndComment(currentNode)) {
                        depth--;
                        if (depth === 0)
                            return children;
                    }

                    children.push(currentNode);

                    if (isStartComment(currentNode))
                        depth++;
                }
                if (!allowUnbalanced)
                    throw new Error("Cannot find closing comment tag to match: " + startComment.nodeValue);
                return null;
            }

            function getMatchingEndComment(startComment, allowUnbalanced) {
                var allVirtualChildren = getVirtualChildren(startComment, allowUnbalanced);
                if (allVirtualChildren) {
                    if (allVirtualChildren.length > 0)
                        return allVirtualChildren[allVirtualChildren.length - 1].nextSibling;
                    return startComment.nextSibling;
                } else
                    return null; // Must have no matching end comment, and allowUnbalanced is true
            }

            function getUnbalancedChildTags(node) {
                // e.g., from <div>OK</div><!-- ko blah --><span>Another</span>, returns: <!-- ko blah --><span>Another</span>
                //       from <div>OK</div><!-- /ko --><!-- /ko -->,             returns: <!-- /ko --><!-- /ko -->
                var childNode = node.firstChild, captureRemaining = null;
                if (childNode) {
                    do {
                        if (captureRemaining)                   // We already hit an unbalanced node and are now just scooping up all subsequent nodes
                            captureRemaining.push(childNode);
                        else if (isStartComment(childNode)) {
                            var matchingEndComment = getMatchingEndComment(childNode, /* allowUnbalanced: */ true);
                            if (matchingEndComment)             // It's a balanced tag, so skip immediately to the end of this virtual set
                                childNode = matchingEndComment;
                            else
                                captureRemaining = [childNode]; // It's unbalanced, so start capturing from this point
                        } else if (isEndComment(childNode)) {
                            captureRemaining = [childNode]; // It's unbalanced (if it wasn't, we'd have skipped over it already), so start capturing
                        }
                    } while (childNode = childNode.nextSibling);
                }
                return captureRemaining;
            }

            ko.virtualElements = {
                allowedBindings: {},

                childNodes: function(node) {
                    return isStartComment(node) ? getVirtualChildren(node) : node.childNodes;
                },

                emptyNode: function(node) {
                    if (!isStartComment(node))
                        ko.utils.emptyDomNode(node);
                    else {
                        var virtualChildren = ko.virtualElements.childNodes(node);
                        for (var i = 0, j = virtualChildren.length; i < j; i++)
                            ko.removeNode(virtualChildren[i]);
                    }
                },

                setDomNodeChildren: function(node, childNodes) {
                    if (!isStartComment(node))
                        ko.utils.setDomNodeChildren(node, childNodes);
                    else {
                        ko.virtualElements.emptyNode(node);
                        var endCommentNode = node.nextSibling; // Must be the next sibling, as we just emptied the children
                        for (var i = 0, j = childNodes.length; i < j; i++)
                            endCommentNode.parentNode.insertBefore(childNodes[i], endCommentNode);
                    }
                },

                prepend: function(containerNode, nodeToPrepend) {
                    if (!isStartComment(containerNode)) {
                        if (containerNode.firstChild)
                            containerNode.insertBefore(nodeToPrepend, containerNode.firstChild);
                        else
                            containerNode.appendChild(nodeToPrepend);
                    } else {
                        // Start comments must always have a parent and at least one following sibling (the end comment)
                        containerNode.parentNode.insertBefore(nodeToPrepend, containerNode.nextSibling);
                    }
                },

                insertAfter: function(containerNode, nodeToInsert, insertAfterNode) {
                    if (!isStartComment(containerNode)) {
                        // Insert after insertion point
                        if (insertAfterNode.nextSibling)
                            containerNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
                        else
                            containerNode.appendChild(nodeToInsert);
                    } else {
                        // Children of start comments must always have a parent and at least one following sibling (the end comment)
                        containerNode.parentNode.insertBefore(nodeToInsert, insertAfterNode.nextSibling);
                    }
                },

                firstChild: function(node) {
                    if (!isStartComment(node))
                        return node.firstChild;
                    if (!node.nextSibling || isEndComment(node.nextSibling))
                        return null;
                    return node.nextSibling;
                },

                nextSibling: function(node) {
                    if (isStartComment(node))
                        node = getMatchingEndComment(node);
                    if (node.nextSibling && isEndComment(node.nextSibling))
                        return null;
                    return node.nextSibling;
                },

                virtualNodeBindingValue: function(node) {
                    var regexMatch = isStartComment(node);
                    return regexMatch ? regexMatch[1] : null;
                },

                normaliseVirtualElementDomStructure: function(elementVerified) {
                    // Workaround for https://github.com/SteveSanderson/knockout/issues/155
                    // (IE <= 8 or IE 9 quirks mode parses your HTML weirdly, treating closing </li> tags as if they don't exist, thereby moving comment nodes
                    // that are direct descendants of <ul> into the preceding <li>)
                    if (!htmlTagsWithOptionallyClosingChildren[ko.utils.tagNameLower(elementVerified)])
                        return;

                    // Scan immediate children to see if they contain unbalanced comment tags. If they do, those comment tags
                    // must be intended to appear *after* that child, so move them there.
                    var childNode = elementVerified.firstChild;
                    if (childNode) {
                        do {
                            if (childNode.nodeType === 1) {
                                var unbalancedTags = getUnbalancedChildTags(childNode);
                                if (unbalancedTags) {
                                    // Fix up the DOM by moving the unbalanced tags to where they most likely were intended to be placed - *after* the child
                                    var nodeToInsertBefore = childNode.nextSibling;
                                    for (var i = 0; i < unbalancedTags.length; i++) {
                                        if (nodeToInsertBefore)
                                            elementVerified.insertBefore(unbalancedTags[i], nodeToInsertBefore);
                                        else
                                            elementVerified.appendChild(unbalancedTags[i]);
                                    }
                                }
                            }
                        } while (childNode = childNode.nextSibling);
                    }
                }
            };
        })();
        ko.exportSymbol('virtualElements', ko.virtualElements);
        ko.exportSymbol('virtualElements.allowedBindings', ko.virtualElements.allowedBindings);
        ko.exportSymbol('virtualElements.emptyNode', ko.virtualElements.emptyNode);
//ko.exportSymbol('virtualElements.firstChild', ko.virtualElements.firstChild);     // firstChild is not minified
        ko.exportSymbol('virtualElements.insertAfter', ko.virtualElements.insertAfter);
//ko.exportSymbol('virtualElements.nextSibling', ko.virtualElements.nextSibling);   // nextSibling is not minified
        ko.exportSymbol('virtualElements.prepend', ko.virtualElements.prepend);
        ko.exportSymbol('virtualElements.setDomNodeChildren', ko.virtualElements.setDomNodeChildren);
        (function() {
            var defaultBindingAttributeName = "data-bind";

            ko.bindingProvider = function() {
                this.bindingCache = {};
            };

            ko.utils.extend(ko.bindingProvider.prototype, {
                'nodeHasBindings': function(node) {
                    switch (node.nodeType) {
                    case 1:
                        return node.getAttribute(defaultBindingAttributeName) != null;
// Element
                    case 8:
                        return ko.virtualElements.virtualNodeBindingValue(node) != null;
// Comment node
                    default:
                        return false;
                    }
                },

                'getBindings': function(node, bindingContext) {
                    var bindingsString = this['getBindingsString'](node, bindingContext);
                    return bindingsString ? this['parseBindingsString'](bindingsString, bindingContext) : null;
                },

                // The following function is only used internally by this default provider.
                // It's not part of the interface definition for a general binding provider.
                'getBindingsString': function(node, bindingContext) {
                    switch (node.nodeType) {
                    case 1:
                        return node.getAttribute(defaultBindingAttributeName);
// Element
                    case 8:
                        return ko.virtualElements.virtualNodeBindingValue(node);
// Comment node
                    default:
                        return null;
                    }
                },

                // The following function is only used internally by this default provider.
                // It's not part of the interface definition for a general binding provider.
                'parseBindingsString': function(bindingsString, bindingContext) {
                    try {
                        var viewModel = bindingContext['$data'],
                            scopes = (typeof viewModel == 'object' && viewModel != null) ? [viewModel, bindingContext] : [bindingContext],
                            bindingFunction = createBindingsStringEvaluatorViaCache(bindingsString, scopes.length, this.bindingCache);
                        return bindingFunction(scopes);
                    } catch(ex) {
                        throw new Error("Unable to parse bindings.\nMessage: " + ex + ";\nBindings value: " + bindingsString);
                    }
                }
            });

            ko.bindingProvider['instance'] = new ko.bindingProvider();

            function createBindingsStringEvaluatorViaCache(bindingsString, scopesCount, cache) {
                var cacheKey = scopesCount + '_' + bindingsString;
                return cache[cacheKey]
                    || (cache[cacheKey] = createBindingsStringEvaluator(bindingsString, scopesCount));
            }

            function createBindingsStringEvaluator(bindingsString, scopesCount) {
                var rewrittenBindings = " { " + ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson(bindingsString) + " } ";
                return ko.utils.buildEvalWithinScopeFunction(rewrittenBindings, scopesCount);
            }
        })();

        ko.exportSymbol('bindingProvider', ko.bindingProvider);
        (function() {
            ko.bindingHandlers = {};

            ko.bindingContext = function(dataItem, parentBindingContext) {
                if (parentBindingContext) {
                    ko.utils.extend(this, parentBindingContext); // Inherit $root and any custom properties
                    this['$parentContext'] = parentBindingContext;
                    this['$parent'] = parentBindingContext['$data'];
                    this['$parents'] = (parentBindingContext['$parents'] || []).slice(0);
                    this['$parents'].unshift(this['$parent']);
                } else {
                    this['$parents'] = [];
                    this['$root'] = dataItem;
                }
                this['$data'] = dataItem;
            };
            ko.bindingContext.prototype['createChildContext'] = function(dataItem) {
                return new ko.bindingContext(dataItem, this);
            };
            ko.bindingContext.prototype['extend'] = function(properties) {
                var clone = ko.utils.extend(new ko.bindingContext(), this);
                return ko.utils.extend(clone, properties);
            };

            function validateThatBindingIsAllowedForVirtualElements(bindingName) {
                var validator = ko.virtualElements.allowedBindings[bindingName];
                if (!validator)
                    throw new Error("The binding '" + bindingName + "' cannot be used with virtual elements");
            }

            function applyBindingsToDescendantsInternal(viewModel, elementOrVirtualElement, bindingContextsMayDifferFromDomParentElement) {
                var currentChild, nextInQueue = ko.virtualElements.firstChild(elementOrVirtualElement);
                while (currentChild = nextInQueue) {
                    // Keep a record of the next child *before* applying bindings, in case the binding removes the current child from its position
                    nextInQueue = ko.virtualElements.nextSibling(currentChild);
                    applyBindingsToNodeAndDescendantsInternal(viewModel, currentChild, bindingContextsMayDifferFromDomParentElement);
                }
            }

            function applyBindingsToNodeAndDescendantsInternal(viewModel, nodeVerified, bindingContextMayDifferFromDomParentElement) {
                var shouldBindDescendants = true;

                // Perf optimisation: Apply bindings only if...
                // (1) We need to store the binding context on this node (because it may differ from the DOM parent node's binding context)
                //     Note that we can't store binding contexts on non-elements (e.g., text nodes), as IE doesn't allow expando properties for those
                // (2) It might have bindings (e.g., it has a data-bind attribute, or it's a marker for a containerless template)
                var isElement = (nodeVerified.nodeType === 1);
                if (isElement) // Workaround IE <= 8 HTML parsing weirdness
                    ko.virtualElements.normaliseVirtualElementDomStructure(nodeVerified);

                var shouldApplyBindings = (isElement && bindingContextMayDifferFromDomParentElement)             // Case (1)
                    || ko.bindingProvider['instance']['nodeHasBindings'](nodeVerified); // Case (2)
                if (shouldApplyBindings)
                    shouldBindDescendants = applyBindingsToNodeInternal(nodeVerified, null, viewModel, bindingContextMayDifferFromDomParentElement).shouldBindDescendants;

                if (shouldBindDescendants) {
                    // We're recursing automatically into (real or virtual) child nodes without changing binding contexts. So,
                    //  * For children of a *real* element, the binding context is certainly the same as on their DOM .parentNode,
                    //    hence bindingContextsMayDifferFromDomParentElement is false
                    //  * For children of a *virtual* element, we can't be sure. Evaluating .parentNode on those children may
                    //    skip over any number of intermediate virtual elements, any of which might define a custom binding context,
                    //    hence bindingContextsMayDifferFromDomParentElement is true
                    applyBindingsToDescendantsInternal(viewModel, nodeVerified, /* bindingContextsMayDifferFromDomParentElement: */ !isElement);
                }
            }

            function applyBindingsToNodeInternal(node, bindings, viewModelOrBindingContext, bindingContextMayDifferFromDomParentElement) {
                // Need to be sure that inits are only run once, and updates never run until all the inits have been run
                var initPhase = 0; // 0 = before all inits, 1 = during inits, 2 = after all inits

                // Each time the dependentObservable is evaluated (after data changes),
                // the binding attribute is reparsed so that it can pick out the correct
                // model properties in the context of the changed data.
                // DOM event callbacks need to be able to access this changed data,
                // so we need a single parsedBindings variable (shared by all callbacks
                // associated with this node's bindings) that all the closures can access.
                var parsedBindings;

                function makeValueAccessor(bindingKey) {
                    return function() { return parsedBindings[bindingKey]; };
                }

                function parsedBindingsAccessor() {
                    return parsedBindings;
                }

                var bindingHandlerThatControlsDescendantBindings;
                ko.dependentObservable(
                    function() {
                        // Ensure we have a nonnull binding context to work with
                        var bindingContextInstance = viewModelOrBindingContext && (viewModelOrBindingContext instanceof ko.bindingContext)
                            ? viewModelOrBindingContext
                            : new ko.bindingContext(ko.utils.unwrapObservable(viewModelOrBindingContext));
                        var viewModel = bindingContextInstance['$data'];

                        // Optimization: Don't store the binding context on this node if it's definitely the same as on node.parentNode, because
                        // we can easily recover it just by scanning up the node's ancestors in the DOM
                        // (note: here, parent node means "real DOM parent" not "virtual parent", as there's no O(1) way to find the virtual parent)
                        if (bindingContextMayDifferFromDomParentElement)
                            ko.storedBindingContextForNode(node, bindingContextInstance);

                        // Use evaluatedBindings if given, otherwise fall back on asking the bindings provider to give us some bindings
                        var evaluatedBindings = (typeof bindings == "function") ? bindings() : bindings;
                        parsedBindings = evaluatedBindings || ko.bindingProvider['instance']['getBindings'](node, bindingContextInstance);

                        if (parsedBindings) {
                            // First run all the inits, so bindings can register for notification on changes
                            if (initPhase === 0) {
                                initPhase = 1;
                                for (var bindingKey in parsedBindings) {
                                    var binding = ko.bindingHandlers[bindingKey];
                                    if (binding && node.nodeType === 8)
                                        validateThatBindingIsAllowedForVirtualElements(bindingKey);

                                    if (binding && typeof binding["init"] == "function") {
                                        var handlerInitFn = binding["init"];
                                        var initResult = handlerInitFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);

                                        // If this binding handler claims to control descendant bindings, make a note of this
                                        if (initResult && initResult['controlsDescendantBindings']) {
                                            if (bindingHandlerThatControlsDescendantBindings !== undefined)
                                                throw new Error("Multiple bindings (" + bindingHandlerThatControlsDescendantBindings + " and " + bindingKey + ") are trying to control descendant bindings of the same element. You cannot use these bindings together on the same element.");
                                            bindingHandlerThatControlsDescendantBindings = bindingKey;
                                        }
                                    }
                                }
                                initPhase = 2;
                            }

                            // ... then run all the updates, which might trigger changes even on the first evaluation
                            if (initPhase === 2) {
                                for (var bindingKey in parsedBindings) {
                                    var binding = ko.bindingHandlers[bindingKey];
                                    if (binding && typeof binding["update"] == "function") {
                                        var handlerUpdateFn = binding["update"];
                                        handlerUpdateFn(node, makeValueAccessor(bindingKey), parsedBindingsAccessor, viewModel, bindingContextInstance);
                                    }
                                }
                            }
                        }
                    },
                    null,
                    { 'disposeWhenNodeIsRemoved': node }
                );

                return {
                    shouldBindDescendants: bindingHandlerThatControlsDescendantBindings === undefined
                };
            }

            ;

            var storedBindingContextDomDataKey = "__ko_bindingContext__";
            ko.storedBindingContextForNode = function(node, bindingContext) {
                if (arguments.length == 2)
                    ko.utils.domData.set(node, storedBindingContextDomDataKey, bindingContext);
                else
                    return ko.utils.domData.get(node, storedBindingContextDomDataKey);
            };
            ko.applyBindingsToNode = function(node, bindings, viewModel) {
                if (node.nodeType === 1) // If it's an element, workaround IE <= 8 HTML parsing weirdness
                    ko.virtualElements.normaliseVirtualElementDomStructure(node);
                return applyBindingsToNodeInternal(node, bindings, viewModel, true);
            };

            ko.applyBindingsToDescendants = function(viewModel, rootNode) {
                if (rootNode.nodeType === 1 || rootNode.nodeType === 8)
                    applyBindingsToDescendantsInternal(viewModel, rootNode, true);
            };

            ko.applyBindings = function(viewModel, rootNode) {
                if (rootNode && (rootNode.nodeType !== 1) && (rootNode.nodeType !== 8))
                    throw new Error("ko.applyBindings: first parameter should be your view model; second parameter should be a DOM node");
                rootNode = rootNode || window.document.body; // Make "rootNode" parameter optional

                applyBindingsToNodeAndDescendantsInternal(viewModel, rootNode, true);
            };

            // Retrieving binding context from arbitrary nodes
            ko.contextFor = function(node) {
                // We can only do something meaningful for elements and comment nodes (in particular, not text nodes, as IE can't store domdata for them)
                switch (node.nodeType) {
                case 1:
                case 8:
                    var context = ko.storedBindingContextForNode(node);
                    if (context) return context;
                    if (node.parentNode) return ko.contextFor(node.parentNode);
                    break;
                }
                return undefined;
            };
            ko.dataFor = function(node) {
                var context = ko.contextFor(node);
                return context ? context['$data'] : undefined;
            };

            ko.exportSymbol('bindingHandlers', ko.bindingHandlers);
            ko.exportSymbol('applyBindings', ko.applyBindings);
            ko.exportSymbol('applyBindingsToDescendants', ko.applyBindingsToDescendants);
            ko.exportSymbol('applyBindingsToNode', ko.applyBindingsToNode);
            ko.exportSymbol('contextFor', ko.contextFor);
            ko.exportSymbol('dataFor', ko.dataFor);
        })();
// For certain common events (currently just 'click'), allow a simplified data-binding syntax
// e.g. click:handler instead of the usual full-length event:{click:handler}
        var eventHandlersWithShortcuts = ['click'];
        ko.utils.arrayForEach(eventHandlersWithShortcuts, function(eventName) {
            ko.bindingHandlers[eventName] = {
                'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
                    var newValueAccessor = function() {
                        var result = {};
                        result[eventName] = valueAccessor();
                        return result;
                    };
                    return ko.bindingHandlers['event']['init'].call(this, element, newValueAccessor, allBindingsAccessor, viewModel);
                }
            };
        });


        ko.bindingHandlers['event'] = {
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
                var eventsToHandle = valueAccessor() || {};
                for (var eventNameOutsideClosure in eventsToHandle) {
                    (function() {
                        var eventName = eventNameOutsideClosure; // Separate variable to be captured by event handler closure
                        if (typeof eventName == "string") {
                            ko.utils.registerEventHandler(element, eventName, function(event) {
                                var handlerReturnValue;
                                var handlerFunction = valueAccessor()[eventName];
                                if (!handlerFunction)
                                    return;
                                var allBindings = allBindingsAccessor();

                                try {
                                    // Take all the event args, and prefix with the viewmodel
                                    var argsForHandler = ko.utils.makeArray(arguments);
                                    argsForHandler.unshift(viewModel);
                                    handlerReturnValue = handlerFunction.apply(viewModel, argsForHandler);
                                } finally {
                                    if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                                        if (event.preventDefault)
                                            event.preventDefault();
                                        else
                                            event.returnValue = false;
                                    }
                                }

                                var bubble = allBindings[eventName + 'Bubble'] !== false;
                                if (!bubble) {
                                    event.cancelBubble = true;
                                    if (event.stopPropagation)
                                        event.stopPropagation();
                                }
                            });
                        }
                    })();
                }
            }
        };

        ko.bindingHandlers['submit'] = {
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel) {
                if (typeof valueAccessor() != "function")
                    throw new Error("The value for a submit binding must be a function");
                ko.utils.registerEventHandler(element, "submit", function(event) {
                    var handlerReturnValue;
                    var value = valueAccessor();
                    try {
                        handlerReturnValue = value.call(viewModel, element);
                    } finally {
                        if (handlerReturnValue !== true) { // Normally we want to prevent default action. Developer can override this be explicitly returning true.
                            if (event.preventDefault)
                                event.preventDefault();
                            else
                                event.returnValue = false;
                        }
                    }
                });
            }
        };

        ko.bindingHandlers['visible'] = {
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                var isCurrentlyVisible = !(element.style.display == "none");
                if (value && !isCurrentlyVisible)
                    element.style.display = "";
                else if ((!value) && isCurrentlyVisible)
                    element.style.display = "none";
            }
        };
        ko.bindingHandlers['enable'] = {
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                if (value && element.disabled)
                    element.removeAttribute("disabled");
                else if ((!value) && (!element.disabled))
                    element.disabled = true;
            }
        };

        ko.bindingHandlers['disable'] = {
            'update': function(element, valueAccessor) {
                ko.bindingHandlers['enable']['update'](element, function() { return !ko.utils.unwrapObservable(valueAccessor()); });
            }
        };

        function ensureDropdownSelectionIsConsistentWithModelValue(element, modelValue, preferModelValue) {
            if (preferModelValue) {
                if (modelValue !== ko.selectExtensions.readValue(element))
                    ko.selectExtensions.writeValue(element, modelValue);
            }

            // No matter which direction we're syncing in, we want the end result to be equality between dropdown value and model value.
            // If they aren't equal, either we prefer the dropdown value, or the model value couldn't be represented, so either way,
            // change the model value to match the dropdown.
            if (modelValue !== ko.selectExtensions.readValue(element))
                ko.utils.triggerEvent(element, "change");
        }

        ;

        ko.bindingHandlers['value'] = {
            'init': function(element, valueAccessor, allBindingsAccessor) {
                // Always catch "change" event; possibly other events too if asked
                var eventsToCatch = ["change"];
                var requestedEventsToCatch = allBindingsAccessor()["valueUpdate"];
                if (requestedEventsToCatch) {
                    if (typeof requestedEventsToCatch == "string") // Allow both individual event names, and arrays of event names
                        requestedEventsToCatch = [requestedEventsToCatch];
                    ko.utils.arrayPushAll(eventsToCatch, requestedEventsToCatch);
                    eventsToCatch = ko.utils.arrayGetDistinctValues(eventsToCatch);
                }

                var valueUpdateHandler = function() {
                    var modelValue = valueAccessor();
                    var elementValue = ko.selectExtensions.readValue(element);
                    ko.jsonExpressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'value', elementValue, /* checkIfDifferent: */ true);
                }; // Workaround for https://github.com/SteveSanderson/knockout/issues/122
                // IE doesn't fire "change" events on textboxes if the user selects a value from its autocomplete list
                var ieAutoCompleteHackNeeded = ko.utils.ieVersion && element.tagName.toLowerCase() == "input" && element.type == "text"
                    && element.autocomplete != "off" && (!element.form || element.form.autocomplete != "off");
                if (ieAutoCompleteHackNeeded && ko.utils.arrayIndexOf(eventsToCatch, "propertychange") == -1) {
                    var propertyChangedFired = false;
                    ko.utils.registerEventHandler(element, "propertychange", function() { propertyChangedFired = true; });
                    ko.utils.registerEventHandler(element, "blur", function() {
                        if (propertyChangedFired) {
                            propertyChangedFired = false;
                            valueUpdateHandler();
                        }
                    });
                }

                ko.utils.arrayForEach(eventsToCatch, function(eventName) {
                    // The syntax "after<eventname>" means "run the handler asynchronously after the event"
                    // This is useful, for example, to catch "keydown" events after the browser has updated the control
                    // (otherwise, ko.selectExtensions.readValue(this) will receive the control's value *before* the key event)
                    var handler = valueUpdateHandler;
                    if (ko.utils.stringStartsWith(eventName, "after")) {
                        handler = function() { setTimeout(valueUpdateHandler, 0); };
                        eventName = eventName.substring("after".length);
                    }
                    ko.utils.registerEventHandler(element, eventName, handler);
                });
            },
            'update': function(element, valueAccessor) {
                var valueIsSelectOption = ko.utils.tagNameLower(element) === "select";
                var newValue = ko.utils.unwrapObservable(valueAccessor());
                var elementValue = ko.selectExtensions.readValue(element);
                var valueHasChanged = (newValue != elementValue);

                // JavaScript's 0 == "" behavious is unfortunate here as it prevents writing 0 to an empty text box (loose equality suggests the values are the same).
                // We don't want to do a strict equality comparison as that is more confusing for developers in certain cases, so we specifically special case 0 != "" here.
                if ((newValue === 0) && (elementValue !== 0) && (elementValue !== "0"))
                    valueHasChanged = true;

                if (valueHasChanged) {
                    var applyValueAction = function() { ko.selectExtensions.writeValue(element, newValue); };
                    applyValueAction();

                    // Workaround for IE6 bug: It won't reliably apply values to SELECT nodes during the same execution thread
                    // right after you've changed the set of OPTION nodes on it. So for that node type, we'll schedule a second thread
                    // to apply the value as well.
                    var alsoApplyAsynchronously = valueIsSelectOption;
                    if (alsoApplyAsynchronously)
                        setTimeout(applyValueAction, 0);
                }

                // If you try to set a model value that can't be represented in an already-populated dropdown, reject that change,
                // because you're not allowed to have a model value that disagrees with a visible UI selection.
                if (valueIsSelectOption && (element.length > 0))
                    ensureDropdownSelectionIsConsistentWithModelValue(element, newValue, /* preferModelValue */ false);
            }
        };

        ko.bindingHandlers['options'] = {
            'update': function(element, valueAccessor, allBindingsAccessor) {
                if (ko.utils.tagNameLower(element) !== "select")
                    throw new Error("options binding applies only to SELECT elements");

                var selectWasPreviouslyEmpty = element.length == 0;
                var previousSelectedValues = ko.utils.arrayMap(ko.utils.arrayFilter(element.childNodes, function(node) {
                    return node.tagName && (ko.utils.tagNameLower(node) === "option") && node.selected;
                }), function(node) {
                    return ko.selectExtensions.readValue(node) || node.innerText || node.textContent;
                });
                var previousScrollTop = element.scrollTop;

                var value = ko.utils.unwrapObservable(valueAccessor());
                var selectedValue = element.value;

                // Remove all existing <option>s.
                // Need to use .remove() rather than .removeChild() for <option>s otherwise IE behaves oddly (https://github.com/SteveSanderson/knockout/issues/134)
                while (element.length > 0) {
                    ko.cleanNode(element.options[0]);
                    element.remove(0);
                }

                if (value) {
                    var allBindings = allBindingsAccessor();
                    if (typeof value.length != "number")
                        value = [value];
                    if (allBindings['optionsCaption']) {
                        var option = document.createElement("option");
                        ko.utils.setHtml(option, allBindings['optionsCaption']);
                        ko.selectExtensions.writeValue(option, undefined);
                        element.appendChild(option);
                    }
                    for (var i = 0, j = value.length; i < j; i++) {
                        var option = document.createElement("option");

                        // Apply a value to the option element
                        var optionValue = typeof allBindings['optionsValue'] == "string" ? value[i][allBindings['optionsValue']] : value[i];
                        optionValue = ko.utils.unwrapObservable(optionValue);
                        ko.selectExtensions.writeValue(option, optionValue);

                        // Apply some text to the option element
                        var optionsTextValue = allBindings['optionsText'];
                        var optionText;
                        if (typeof optionsTextValue == "function")
                            optionText = optionsTextValue(value[i]); // Given a function; run it against the data value
                        else if (typeof optionsTextValue == "string")
                            optionText = value[i][optionsTextValue]; // Given a string; treat it as a property name on the data value
                        else
                            optionText = optionValue; // Given no optionsText arg; use the data value itself
                        if ((optionText === null) || (optionText === undefined))
                            optionText = "";

                        ko.utils.setTextContent(option, optionText);

                        element.appendChild(option);
                    }

                    // IE6 doesn't like us to assign selection to OPTION nodes before they're added to the document.
                    // That's why we first added them without selection. Now it's time to set the selection.
                    var newOptions = element.getElementsByTagName("option");
                    var countSelectionsRetained = 0;
                    for (var i = 0, j = newOptions.length; i < j; i++) {
                        if (ko.utils.arrayIndexOf(previousSelectedValues, ko.selectExtensions.readValue(newOptions[i])) >= 0) {
                            ko.utils.setOptionNodeSelectionState(newOptions[i], true);
                            countSelectionsRetained++;
                        }
                    }

                    element.scrollTop = previousScrollTop;

                    if (selectWasPreviouslyEmpty && ('value' in allBindings)) {
                        // Ensure consistency between model value and selected option.
                        // If the dropdown is being populated for the first time here (or was otherwise previously empty),
                        // the dropdown selection state is meaningless, so we preserve the model value.
                        ensureDropdownSelectionIsConsistentWithModelValue(element, ko.utils.unwrapObservable(allBindings['value']), /* preferModelValue */ true);
                    }

                    // Workaround for IE9 bug
                    ko.utils.ensureSelectElementIsRenderedCorrectly(element);
                }
            }
        };
        ko.bindingHandlers['options'].optionValueDomDataKey = '__ko.optionValueDomData__';

        ko.bindingHandlers['selectedOptions'] = {
            getSelectedValuesFromSelectNode: function(selectNode) {
                var result = [];
                var nodes = selectNode.childNodes;
                for (var i = 0, j = nodes.length; i < j; i++) {
                    var node = nodes[i], tagName = ko.utils.tagNameLower(node);
                    if (tagName == "option" && node.selected)
                        result.push(ko.selectExtensions.readValue(node));
                    else if (tagName == "optgroup") {
                        var selectedValuesFromOptGroup = ko.bindingHandlers['selectedOptions'].getSelectedValuesFromSelectNode(node);
                        Array.prototype.splice.apply(result, [result.length, 0].concat(selectedValuesFromOptGroup)); // Add new entries to existing 'result' instance
                    }
                }
                return result;
            },
            'init': function(element, valueAccessor, allBindingsAccessor) {
                ko.utils.registerEventHandler(element, "change", function() {
                    var value = valueAccessor();
                    var valueToWrite = ko.bindingHandlers['selectedOptions'].getSelectedValuesFromSelectNode(this);
                    ko.jsonExpressionRewriting.writeValueToProperty(value, allBindingsAccessor, 'value', valueToWrite);
                });
            },
            'update': function(element, valueAccessor) {
                if (ko.utils.tagNameLower(element) != "select")
                    throw new Error("values binding applies only to SELECT elements");

                var newValue = ko.utils.unwrapObservable(valueAccessor());
                if (newValue && typeof newValue.length == "number") {
                    var nodes = element.childNodes;
                    for (var i = 0, j = nodes.length; i < j; i++) {
                        var node = nodes[i];
                        if (ko.utils.tagNameLower(node) === "option")
                            ko.utils.setOptionNodeSelectionState(node, ko.utils.arrayIndexOf(newValue, ko.selectExtensions.readValue(node)) >= 0);
                    }
                }
            }
        };

        ko.bindingHandlers['text'] = {
            'update': function(element, valueAccessor) {
                ko.utils.setTextContent(element, valueAccessor());
            }
        };

        ko.bindingHandlers['html'] = {
            'init': function() {
                // Prevent binding on the dynamically-injected HTML (as developers are unlikely to expect that, and it has security implications)
                return { 'controlsDescendantBindings': true };
            },
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                ko.utils.setHtml(element, value);
            }
        };

        ko.bindingHandlers['css'] = {
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor() || {});
                for (var className in value) {
                    if (typeof className == "string") {
                        var shouldHaveClass = ko.utils.unwrapObservable(value[className]);
                        ko.utils.toggleDomNodeCssClass(element, className, shouldHaveClass);
                    }
                }
            }
        };

        ko.bindingHandlers['style'] = {
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor() || {});
                for (var styleName in value) {
                    if (typeof styleName == "string") {
                        var styleValue = ko.utils.unwrapObservable(value[styleName]);
                        element.style[styleName] = styleValue || ""; // Empty string removes the value, whereas null/undefined have no effect
                    }
                }
            }
        };

        ko.bindingHandlers['uniqueName'] = {
            'init': function(element, valueAccessor) {
                if (valueAccessor()) {
                    element.name = "ko_unique_" + (++ko.bindingHandlers['uniqueName'].currentIndex);

                    // Workaround IE 6/7 issue
                    // - https://github.com/SteveSanderson/knockout/issues/197
                    // - http://www.matts411.com/post/setting_the_name_attribute_in_ie_dom/
                    if (ko.utils.isIe6 || ko.utils.isIe7)
                        element.mergeAttributes(document.createElement("<input name='" + element.name + "'/>"), false);
                }
            }
        };
        ko.bindingHandlers['uniqueName'].currentIndex = 0;

        ko.bindingHandlers['checked'] = {
            'init': function(element, valueAccessor, allBindingsAccessor) {
                var updateHandler = function() {
                    var valueToWrite;
                    if (element.type == "checkbox") {
                        valueToWrite = element.checked;
                    } else if ((element.type == "radio") && (element.checked)) {
                        valueToWrite = element.value;
                    } else {
                        return; // "checked" binding only responds to checkboxes and selected radio buttons
                    }

                    var modelValue = valueAccessor();
                    if ((element.type == "checkbox") && (ko.utils.unwrapObservable(modelValue) instanceof Array)) {
                        // For checkboxes bound to an array, we add/remove the checkbox value to that array
                        // This works for both observable and non-observable arrays
                        var existingEntryIndex = ko.utils.arrayIndexOf(ko.utils.unwrapObservable(modelValue), element.value);
                        if (element.checked && (existingEntryIndex < 0))
                            modelValue.push(element.value);
                        else if ((!element.checked) && (existingEntryIndex >= 0))
                            modelValue.splice(existingEntryIndex, 1);
                    } else {
                        ko.jsonExpressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'checked', valueToWrite, true);
                    }
                };
                ko.utils.registerEventHandler(element, "click", updateHandler);

                // IE 6 won't allow radio buttons to be selected unless they have a name
                if ((element.type == "radio") && !element.name)
                    ko.bindingHandlers['uniqueName']['init'](element, function() { return true; });
            },
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());

                if (element.type == "checkbox") {
                    if (value instanceof Array) {
                        // When bound to an array, the checkbox being checked represents its value being present in that array
                        element.checked = ko.utils.arrayIndexOf(value, element.value) >= 0;
                    } else {
                        // When bound to anything other value (not an array), the checkbox being checked represents the value being trueish
                        element.checked = value;
                    }
                } else if (element.type == "radio") {
                    element.checked = (element.value == value);
                }
            }
        };

        var attrHtmlToJavascriptMap = { 'class': 'className', 'for': 'htmlFor' };
        ko.bindingHandlers['attr'] = {
            'update': function(element, valueAccessor, allBindingsAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor()) || {};
                for (var attrName in value) {
                    if (typeof attrName == "string") {
                        var attrValue = ko.utils.unwrapObservable(value[attrName]);

                        // To cover cases like "attr: { checked:someProp }", we want to remove the attribute entirely
                        // when someProp is a "no value"-like value (strictly null, false, or undefined)
                        // (because the absence of the "checked" attr is how to mark an element as not checked, etc.)
                        var toRemove = (attrValue === false) || (attrValue === null) || (attrValue === undefined);
                        if (toRemove)
                            element.removeAttribute(attrName);

                        // In IE <= 7 and IE8 Quirks Mode, you have to use the Javascript property name instead of the
                        // HTML attribute name for certain attributes. IE8 Standards Mode supports the correct behavior,
                        // but instead of figuring out the mode, we'll just set the attribute through the Javascript
                        // property for IE <= 8.
                        if (ko.utils.ieVersion <= 8 && attrName in attrHtmlToJavascriptMap) {
                            attrName = attrHtmlToJavascriptMap[attrName];
                            if (toRemove)
                                element.removeAttribute(attrName);
                            else
                                element[attrName] = attrValue;
                        } else if (!toRemove) {
                            element.setAttribute(attrName, attrValue.toString());
                        }
                    }
                }
            }
        };

        ko.bindingHandlers['hasfocus'] = {
            'init': function(element, valueAccessor, allBindingsAccessor) {
                var writeValue = function(valueToWrite) {
                    var modelValue = valueAccessor();
                    ko.jsonExpressionRewriting.writeValueToProperty(modelValue, allBindingsAccessor, 'hasfocus', valueToWrite, true);
                };
                ko.utils.registerEventHandler(element, "focus", function() { writeValue(true); });
                ko.utils.registerEventHandler(element, "focusin", function() { writeValue(true); }); // For IE
                ko.utils.registerEventHandler(element, "blur", function() { writeValue(false); });
                ko.utils.registerEventHandler(element, "focusout", function() { writeValue(false); }); // For IE
            },
            'update': function(element, valueAccessor) {
                var value = ko.utils.unwrapObservable(valueAccessor());
                value ? element.focus() : element.blur();
                ko.utils.triggerEvent(element, value ? "focusin" : "focusout"); // For IE, which doesn't reliably fire "focus" or "blur" events synchronously
            }
        };

// "with: someExpression" is equivalent to "template: { if: someExpression, data: someExpression }"
        ko.bindingHandlers['with'] = {
            makeTemplateValueAccessor: function(valueAccessor) {
                return function() {
                    var value = valueAccessor();
                    return { 'if': value, 'data': value, 'templateEngine': ko.nativeTemplateEngine.instance };
                };
            },
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['with'].makeTemplateValueAccessor(valueAccessor));
            },
            'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['with'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
            }
        };
        ko.jsonExpressionRewriting.bindingRewriteValidators['with'] = false; // Can't rewrite control flow bindings
        ko.virtualElements.allowedBindings['with'] = true;

// "if: someExpression" is equivalent to "template: { if: someExpression }"
        ko.bindingHandlers['if'] = {
            makeTemplateValueAccessor: function(valueAccessor) {
                return function() { return { 'if': valueAccessor(), 'templateEngine': ko.nativeTemplateEngine.instance }; };
            },
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['if'].makeTemplateValueAccessor(valueAccessor));
            },
            'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['if'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
            }
        };
        ko.jsonExpressionRewriting.bindingRewriteValidators['if'] = false; // Can't rewrite control flow bindings
        ko.virtualElements.allowedBindings['if'] = true;

// "ifnot: someExpression" is equivalent to "template: { ifnot: someExpression }"
        ko.bindingHandlers['ifnot'] = {
            makeTemplateValueAccessor: function(valueAccessor) {
                return function() { return { 'ifnot': valueAccessor(), 'templateEngine': ko.nativeTemplateEngine.instance }; };
            },
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['ifnot'].makeTemplateValueAccessor(valueAccessor));
            },
            'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['ifnot'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
            }
        };
        ko.jsonExpressionRewriting.bindingRewriteValidators['ifnot'] = false; // Can't rewrite control flow bindings
        ko.virtualElements.allowedBindings['ifnot'] = true;

// "foreach: someExpression" is equivalent to "template: { foreach: someExpression }"
// "foreach: { data: someExpression, afterAdd: myfn }" is equivalent to "template: { foreach: someExpression, afterAdd: myfn }"
        ko.bindingHandlers['foreach'] = {
            makeTemplateValueAccessor: function(valueAccessor) {
                return function() {
                    var bindingValue = ko.utils.unwrapObservable(valueAccessor());

                    // If bindingValue is the array, just pass it on its own
                    if ((!bindingValue) || typeof bindingValue.length == "number")
                        return { 'foreach': bindingValue, 'templateEngine': ko.nativeTemplateEngine.instance };

                    // If bindingValue.data is the array, preserve all relevant options
                    return {
                        'foreach': bindingValue['data'],
                        'includeDestroyed': bindingValue['includeDestroyed'],
                        'afterAdd': bindingValue['afterAdd'],
                        'beforeRemove': bindingValue['beforeRemove'],
                        'afterRender': bindingValue['afterRender'],
                        'templateEngine': ko.nativeTemplateEngine.instance
                    };
                };
            },
            'init': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['init'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor));
            },
            'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                return ko.bindingHandlers['template']['update'](element, ko.bindingHandlers['foreach'].makeTemplateValueAccessor(valueAccessor), allBindingsAccessor, viewModel, bindingContext);
            }
        };
        ko.jsonExpressionRewriting.bindingRewriteValidators['foreach'] = false; // Can't rewrite control flow bindings
        ko.virtualElements.allowedBindings['foreach'] = true;
// If you want to make a custom template engine,
//
// [1] Inherit from this class (like ko.nativeTemplateEngine does)
// [2] Override 'renderTemplateSource', supplying a function with this signature:
//
//        function (templateSource, bindingContext, options) {
//            // - templateSource.text() is the text of the template you should render
//            // - bindingContext.$data is the data you should pass into the template
//            //   - you might also want to make bindingContext.$parent, bindingContext.$parents,
//            //     and bindingContext.$root available in the template too
//            // - options gives you access to any other properties set on "data-bind: { template: options }"
//            //
//            // Return value: an array of DOM nodes
//        }
//
// [3] Override 'createJavaScriptEvaluatorBlock', supplying a function with this signature:
//
//        function (script) {
//            // Return value: Whatever syntax means "Evaluate the JavaScript statement 'script' and output the result"
//            //               For example, the jquery.tmpl template engine converts 'someScript' to '${ someScript }'
//        }
//
//     This is only necessary if you want to allow data-bind attributes to reference arbitrary template variables.
//     If you don't want to allow that, you can set the property 'allowTemplateRewriting' to false (like ko.nativeTemplateEngine does)
//     and then you don't need to override 'createJavaScriptEvaluatorBlock'.

        ko.templateEngine = function() {
        };

        ko.templateEngine.prototype['renderTemplateSource'] = function(templateSource, bindingContext, options) {
            throw new Error("Override renderTemplateSource");
        };

        ko.templateEngine.prototype['createJavaScriptEvaluatorBlock'] = function(script) {
            throw new Error("Override createJavaScriptEvaluatorBlock");
        };

        ko.templateEngine.prototype['makeTemplateSource'] = function(template, templateDocument) {
            // Named template
            if (typeof template == "string") {
                templateDocument = templateDocument || document;
                var elem = templateDocument.getElementById(template);
                if (!elem)
                    throw new Error("Cannot find template with ID " + template);
                return new ko.templateSources.domElement(elem);
            } else if ((template.nodeType == 1) || (template.nodeType == 8)) {
                // Anonymous template
                return new ko.templateSources.anonymousTemplate(template);
            } else
                throw new Error("Unknown template type: " + template);
        };

        ko.templateEngine.prototype['renderTemplate'] = function(template, bindingContext, options, templateDocument) {
            var templateSource = this['makeTemplateSource'](template, templateDocument);
            return this['renderTemplateSource'](templateSource, bindingContext, options);
        };

        ko.templateEngine.prototype['isTemplateRewritten'] = function(template, templateDocument) {
            // Skip rewriting if requested
            if (this['allowTemplateRewriting'] === false)
                return true;

            // Perf optimisation - see below
            var templateIsInExternalDocument = templateDocument && templateDocument != document;
            if (!templateIsInExternalDocument && this.knownRewrittenTemplates && this.knownRewrittenTemplates[template])
                return true;

            return this['makeTemplateSource'](template, templateDocument)['data']("isRewritten");
        };

        ko.templateEngine.prototype['rewriteTemplate'] = function(template, rewriterCallback, templateDocument) {
            var templateSource = this['makeTemplateSource'](template, templateDocument);
            var rewritten = rewriterCallback(templateSource['text']());
            templateSource['text'](rewritten);
            templateSource['data']("isRewritten", true);

            // Perf optimisation - for named templates, track which ones have been rewritten so we can
            // answer 'isTemplateRewritten' *without* having to use getElementById (which is slow on IE < 8)
            //
            // Note that we only cache the status for templates in the main document, because caching on a per-doc
            // basis complicates the implementation excessively. In a future version of KO, we will likely remove
            // this 'isRewritten' cache entirely anyway, because the benefit is extremely minor and only applies
            // to rewritable templates, which are pretty much deprecated since KO 2.0.
            var templateIsInExternalDocument = templateDocument && templateDocument != document;
            if (!templateIsInExternalDocument && typeof template == "string") {
                this.knownRewrittenTemplates = this.knownRewrittenTemplates || {};
                this.knownRewrittenTemplates[template] = true;
            }
        };

        ko.exportSymbol('templateEngine', ko.templateEngine);

        ko.templateRewriting = (function() {
            var memoizeDataBindingAttributeSyntaxRegex = /(<[a-z]+\d*(\s+(?!data-bind=)[a-z0-9\-]+(=(\"[^\"]*\"|\'[^\']*\'))?)*\s+)data-bind=(["'])([\s\S]*?)\5/gi;
            var memoizeVirtualContainerBindingSyntaxRegex = /<!--\s*ko\b\s*([\s\S]*?)\s*-->/g;

            function validateDataBindValuesForRewriting(keyValueArray) {
                var allValidators = ko.jsonExpressionRewriting.bindingRewriteValidators;
                for (var i = 0; i < keyValueArray.length; i++) {
                    var key = keyValueArray[i]['key'];
                    if (allValidators.hasOwnProperty(key)) {
                        var validator = allValidators[key];

                        if (typeof validator === "function") {
                            var possibleErrorMessage = validator(keyValueArray[i]['value']);
                            if (possibleErrorMessage)
                                throw new Error(possibleErrorMessage);
                        } else if (!validator) {
                            throw new Error("This template engine does not support the '" + key + "' binding within its templates");
                        }
                    }
                }
            }

            function constructMemoizedTagReplacement(dataBindAttributeValue, tagToRetain, templateEngine) {
                var dataBindKeyValueArray = ko.jsonExpressionRewriting.parseObjectLiteral(dataBindAttributeValue);
                validateDataBindValuesForRewriting(dataBindKeyValueArray);
                var rewrittenDataBindAttributeValue = ko.jsonExpressionRewriting.insertPropertyAccessorsIntoJson(dataBindKeyValueArray);

                // For no obvious reason, Opera fails to evaluate rewrittenDataBindAttributeValue unless it's wrapped in an additional
                // anonymous function, even though Opera's built-in debugger can evaluate it anyway. No other browser requires this
                // extra indirection.
                var applyBindingsToNextSiblingScript = "ko.templateRewriting.applyMemoizedBindingsToNextSibling(function() { \
            return (function() { return { " + rewrittenDataBindAttributeValue + " } })() \
        })";
                return templateEngine['createJavaScriptEvaluatorBlock'](applyBindingsToNextSiblingScript) + tagToRetain;
            }

            return {
                ensureTemplateIsRewritten: function(template, templateEngine, templateDocument) {
                    if (!templateEngine['isTemplateRewritten'](template, templateDocument))
                        templateEngine['rewriteTemplate'](template, function(htmlString) {
                            return ko.templateRewriting.memoizeBindingAttributeSyntax(htmlString, templateEngine);
                        }, templateDocument);
                },

                memoizeBindingAttributeSyntax: function(htmlString, templateEngine) {
                    return htmlString.replace(memoizeDataBindingAttributeSyntaxRegex, function() {
                        return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[6], /* tagToRetain: */ arguments[1], templateEngine);
                    }).replace(memoizeVirtualContainerBindingSyntaxRegex, function() {
                        return constructMemoizedTagReplacement(/* dataBindAttributeValue: */ arguments[1], /* tagToRetain: */ "<!-- ko -->", templateEngine);
                    });
                },

                applyMemoizedBindingsToNextSibling: function(bindings) {
                    return ko.memoization.memoize(function(domNode, bindingContext) {
                        if (domNode.nextSibling)
                            ko.applyBindingsToNode(domNode.nextSibling, bindings, bindingContext);
                    });
                }
            };
        })();

        ko.exportSymbol('templateRewriting', ko.templateRewriting);
        ko.exportSymbol('templateRewriting.applyMemoizedBindingsToNextSibling', ko.templateRewriting.applyMemoizedBindingsToNextSibling); // Exported only because it has to be referenced by string lookup from within rewritten template
        (function() {
            // A template source represents a read/write way of accessing a template. This is to eliminate the need for template loading/saving
            // logic to be duplicated in every template engine (and means they can all work with anonymous templates, etc.)
            //
            // Two are provided by default:
            //  1. ko.templateSources.domElement       - reads/writes the text content of an arbitrary DOM element
            //  2. ko.templateSources.anonymousElement - uses ko.utils.domData to read/write text *associated* with the DOM element, but
            //                                           without reading/writing the actual element text content, since it will be overwritten
            //                                           with the rendered template output.
            // You can implement your own template source if you want to fetch/store templates somewhere other than in DOM elements.
            // Template sources need to have the following functions:
            //   text() 			- returns the template text from your storage location
            //   text(value)		- writes the supplied template text to your storage location
            //   data(key)			- reads values stored using data(key, value) - see below
            //   data(key, value)	- associates "value" with this template and the key "key". Is used to store information like "isRewritten".
            //
            // Optionally, template sources can also have the following functions:
            //   nodes()            - returns a DOM element containing the nodes of this template, where available
            //   nodes(value)       - writes the given DOM element to your storage location
            // If a DOM element is available for a given template source, template engines are encouraged to use it in preference over text()
            // for improved speed. However, all templateSources must supply text() even if they don't supply nodes().
            //
            // Once you've implemented a templateSource, make your template engine use it by subclassing whatever template engine you were
            // using and overriding "makeTemplateSource" to return an instance of your custom template source.

            ko.templateSources = {};

            // ---- ko.templateSources.domElement -----

            ko.templateSources.domElement = function(element) {
                this.domElement = element;
            };
            ko.templateSources.domElement.prototype['text'] = function(/* valueToWrite */) {
                var tagNameLower = ko.utils.tagNameLower(this.domElement),
                    elemContentsProperty = tagNameLower === "script" ? "text"
                        : tagNameLower === "textarea" ? "value"
                            : "innerHTML";

                if (arguments.length == 0) {
                    return this.domElement[elemContentsProperty];
                } else {
                    var valueToWrite = arguments[0];
                    if (elemContentsProperty === "innerHTML")
                        ko.utils.setHtml(this.domElement, valueToWrite);
                    else
                        this.domElement[elemContentsProperty] = valueToWrite;
                }
            };

            ko.templateSources.domElement.prototype['data'] = function(key /*, valueToWrite */) {
                if (arguments.length === 1) {
                    return ko.utils.domData.get(this.domElement, "templateSourceData_" + key);
                } else {
                    ko.utils.domData.set(this.domElement, "templateSourceData_" + key, arguments[1]);
                }
            };

            // ---- ko.templateSources.anonymousTemplate -----
            // Anonymous templates are normally saved/retrieved as DOM nodes through "nodes".
            // For compatibility, you can also read "text"; it will be serialized from the nodes on demand.
            // Writing to "text" is still supported, but then the template data will not be available as DOM nodes.

            var anonymousTemplatesDomDataKey = "__ko_anon_template__";
            ko.templateSources.anonymousTemplate = function(element) {
                this.domElement = element;
            };
            ko.templateSources.anonymousTemplate.prototype = new ko.templateSources.domElement();
            ko.templateSources.anonymousTemplate.prototype['text'] = function(/* valueToWrite */) {
                if (arguments.length == 0) {
                    var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                    if (templateData.textData === undefined && templateData.containerData)
                        templateData.textData = templateData.containerData.innerHTML;
                    return templateData.textData;
                } else {
                    var valueToWrite = arguments[0];
                    ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { textData: valueToWrite });
                }
            };
            ko.templateSources.domElement.prototype['nodes'] = function(/* valueToWrite */) {
                if (arguments.length == 0) {
                    var templateData = ko.utils.domData.get(this.domElement, anonymousTemplatesDomDataKey) || {};
                    return templateData.containerData;
                } else {
                    var valueToWrite = arguments[0];
                    ko.utils.domData.set(this.domElement, anonymousTemplatesDomDataKey, { containerData: valueToWrite });
                }
            };

            ko.exportSymbol('templateSources', ko.templateSources);
            ko.exportSymbol('templateSources.domElement', ko.templateSources.domElement);
            ko.exportSymbol('templateSources.anonymousTemplate', ko.templateSources.anonymousTemplate);
        })();
        (function() {
            var _templateEngine;
            ko.setTemplateEngine = function(templateEngine) {
                if ((templateEngine != undefined) && !(templateEngine instanceof ko.templateEngine))
                    throw new Error("templateEngine must inherit from ko.templateEngine");
                _templateEngine = templateEngine;
            };

            function invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, action) {
                var node, nextInQueue = firstNode, firstOutOfRangeNode = ko.virtualElements.nextSibling(lastNode);
                while (nextInQueue && ((node = nextInQueue) !== firstOutOfRangeNode)) {
                    nextInQueue = ko.virtualElements.nextSibling(node);
                    if (node.nodeType === 1 || node.nodeType === 8)
                        action(node);
                }
            }

            function activateBindingsOnContinuousNodeArray(continuousNodeArray, bindingContext) {
                // To be used on any nodes that have been rendered by a template and have been inserted into some parent element
                // Walks through continuousNodeArray (which *must* be continuous, i.e., an uninterrupted sequence of sibling nodes, because
                // the algorithm for walking them relies on this), and for each top-level item in the virtual-element sense,
                // (1) Does a regular "applyBindings" to associate bindingContext with this node and to activate any non-memoized bindings
                // (2) Unmemoizes any memos in the DOM subtree (e.g., to activate bindings that had been memoized during template rewriting)

                if (continuousNodeArray.length) {
                    var firstNode = continuousNodeArray[0], lastNode = continuousNodeArray[continuousNodeArray.length - 1];

                    // Need to applyBindings *before* unmemoziation, because unmemoization might introduce extra nodes (that we don't want to re-bind)
                    // whereas a regular applyBindings won't introduce new memoized nodes
                    invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
                        ko.applyBindings(bindingContext, node);
                    });
                    invokeForEachNodeOrCommentInContinuousRange(firstNode, lastNode, function(node) {
                        ko.memoization.unmemoizeDomNodeAndDescendants(node, [bindingContext]);
                    });
                }
            }

            function getFirstNodeFromPossibleArray(nodeOrNodeArray) {
                return nodeOrNodeArray.nodeType ? nodeOrNodeArray
                    : nodeOrNodeArray.length > 0 ? nodeOrNodeArray[0]
                        : null;
            }

            function executeTemplate(targetNodeOrNodeArray, renderMode, template, bindingContext, options) {
                options = options || {};
                var firstTargetNode = targetNodeOrNodeArray && getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
                var templateDocument = firstTargetNode && firstTargetNode.ownerDocument;
                var templateEngineToUse = (options['templateEngine'] || _templateEngine);
                ko.templateRewriting.ensureTemplateIsRewritten(template, templateEngineToUse, templateDocument);
                var renderedNodesArray = templateEngineToUse['renderTemplate'](template, bindingContext, options, templateDocument);

                // Loosely check result is an array of DOM nodes
                if ((typeof renderedNodesArray.length != "number") || (renderedNodesArray.length > 0 && typeof renderedNodesArray[0].nodeType != "number"))
                    throw new Error("Template engine must return an array of DOM nodes");

                var haveAddedNodesToParent = false;
                switch (renderMode) {
                case "replaceChildren":
                    ko.virtualElements.setDomNodeChildren(targetNodeOrNodeArray, renderedNodesArray);
                    haveAddedNodesToParent = true;
                    break;
                case "replaceNode":
                    ko.utils.replaceDomNodes(targetNodeOrNodeArray, renderedNodesArray);
                    haveAddedNodesToParent = true;
                    break;
                case "ignoreTargetNode":
                    break;
                default:
                    throw new Error("Unknown renderMode: " + renderMode);
                }

                if (haveAddedNodesToParent) {
                    activateBindingsOnContinuousNodeArray(renderedNodesArray, bindingContext);
                    if (options['afterRender'])
                        options['afterRender'](renderedNodesArray, bindingContext['$data']);
                }

                return renderedNodesArray;
            }

            ko.renderTemplate = function(template, dataOrBindingContext, options, targetNodeOrNodeArray, renderMode) {
                options = options || {};
                if ((options['templateEngine'] || _templateEngine) == undefined)
                    throw new Error("Set a template engine before calling renderTemplate");
                renderMode = renderMode || "replaceChildren";

                if (targetNodeOrNodeArray) {
                    var firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);

                    var whenToDispose = function() { return (!firstTargetNode) || !ko.utils.domNodeIsAttachedToDocument(firstTargetNode); }; // Passive disposal (on next evaluation)
                    var activelyDisposeWhenNodeIsRemoved = (firstTargetNode && renderMode == "replaceNode") ? firstTargetNode.parentNode : firstTargetNode;

                    return ko.dependentObservable(// So the DOM is automatically updated when any dependency changes
                        function() {
                            // Ensure we've got a proper binding context to work with
                            var bindingContext = (dataOrBindingContext && (dataOrBindingContext instanceof ko.bindingContext))
                                ? dataOrBindingContext
                                : new ko.bindingContext(ko.utils.unwrapObservable(dataOrBindingContext));

                            // Support selecting template as a function of the data being rendered
                            var templateName = typeof(template) == 'function' ? template(bindingContext['$data']) : template;

                            var renderedNodesArray = executeTemplate(targetNodeOrNodeArray, renderMode, templateName, bindingContext, options);
                            if (renderMode == "replaceNode") {
                                targetNodeOrNodeArray = renderedNodesArray;
                                firstTargetNode = getFirstNodeFromPossibleArray(targetNodeOrNodeArray);
                            }
                        },
                        null,
                        { 'disposeWhen': whenToDispose, 'disposeWhenNodeIsRemoved': activelyDisposeWhenNodeIsRemoved }
                    );
                } else {
                    // We don't yet have a DOM node to evaluate, so use a memo and render the template later when there is a DOM node
                    return ko.memoization.memoize(function(domNode) {
                        ko.renderTemplate(template, dataOrBindingContext, options, domNode, "replaceNode");
                    });
                }
            };

            ko.renderTemplateForEach = function(template, arrayOrObservableArray, options, targetNode, parentBindingContext) {
                // Since setDomNodeChildrenFromArrayMapping always calls executeTemplateForArrayItem and then
                // activateBindingsCallback for added items, we can store the binding context in the former to use in the latter.
                var arrayItemContext;

                // This will be called by setDomNodeChildrenFromArrayMapping to get the nodes to add to targetNode
                var executeTemplateForArrayItem = function(arrayValue, index) {
                    // Support selecting template as a function of the data being rendered
                    var templateName = typeof(template) == 'function' ? template(arrayValue) : template;
                    arrayItemContext = parentBindingContext['createChildContext'](ko.utils.unwrapObservable(arrayValue));
                    arrayItemContext['$index'] = index;
                    return executeTemplate(null, "ignoreTargetNode", templateName, arrayItemContext, options);
                }; // This will be called whenever setDomNodeChildrenFromArrayMapping has added nodes to targetNode
                var activateBindingsCallback = function(arrayValue, addedNodesArray, index) {
                    activateBindingsOnContinuousNodeArray(addedNodesArray, arrayItemContext);
                    if (options['afterRender'])
                        options['afterRender'](addedNodesArray, arrayValue);
                };

                return ko.dependentObservable(function() {
                    var unwrappedArray = ko.utils.unwrapObservable(arrayOrObservableArray) || [];
                    if (typeof unwrappedArray.length == "undefined") // Coerce single value into array
                        unwrappedArray = [unwrappedArray];

                    // Filter out any entries marked as destroyed
                    var filteredArray = ko.utils.arrayFilter(unwrappedArray, function(item) {
                        return options['includeDestroyed'] || item === undefined || item === null || !ko.utils.unwrapObservable(item['_destroy']);
                    });

                    ko.utils.setDomNodeChildrenFromArrayMapping(targetNode, filteredArray, executeTemplateForArrayItem, options, activateBindingsCallback);

                }, null, { 'disposeWhenNodeIsRemoved': targetNode });
            };

            var templateSubscriptionDomDataKey = '__ko__templateSubscriptionDomDataKey__';

            function disposeOldSubscriptionAndStoreNewOne(element, newSubscription) {
                var oldSubscription = ko.utils.domData.get(element, templateSubscriptionDomDataKey);
                if (oldSubscription && (typeof(oldSubscription.dispose) == 'function'))
                    oldSubscription.dispose();
                ko.utils.domData.set(element, templateSubscriptionDomDataKey, newSubscription);
            }

            ko.bindingHandlers['template'] = {
                'init': function(element, valueAccessor) {
                    // Support anonymous templates
                    var bindingValue = ko.utils.unwrapObservable(valueAccessor());
                    if ((typeof bindingValue != "string") && (!bindingValue['name']) && (element.nodeType == 1 || element.nodeType == 8)) {
                        // It's an anonymous template - store the element contents, then clear the element
                        var templateNodes = element.nodeType == 1 ? element.childNodes : ko.virtualElements.childNodes(element),
                            container = ko.utils.moveCleanedNodesToContainerElement(templateNodes); // This also removes the nodes from their current parent
                        new ko.templateSources.anonymousTemplate(element)['nodes'](container);
                    }
                    return { 'controlsDescendantBindings': true };
                },
                'update': function(element, valueAccessor, allBindingsAccessor, viewModel, bindingContext) {
                    var bindingValue = ko.utils.unwrapObservable(valueAccessor());
                    var templateName;
                    var shouldDisplay = true;

                    if (typeof bindingValue == "string") {
                        templateName = bindingValue;
                    } else {
                        templateName = bindingValue['name'];

                        // Support "if"/"ifnot" conditions
                        if ('if' in bindingValue)
                            shouldDisplay = shouldDisplay && ko.utils.unwrapObservable(bindingValue['if']);
                        if ('ifnot' in bindingValue)
                            shouldDisplay = shouldDisplay && !ko.utils.unwrapObservable(bindingValue['ifnot']);
                    }

                    var templateSubscription = null;

                    if ((typeof bindingValue === 'object') && ('foreach' in bindingValue)) { // Note: can't use 'in' operator on strings
                        // Render once for each data point (treating data set as empty if shouldDisplay==false)
                        var dataArray = (shouldDisplay && bindingValue['foreach']) || [];
                        templateSubscription = ko.renderTemplateForEach(templateName || element, dataArray, /* options: */ bindingValue, element, bindingContext);
                    } else {
                        if (shouldDisplay) {
                            // Render once for this single data point (or use the viewModel if no data was provided)
                            var innerBindingContext = (typeof bindingValue == 'object') && ('data' in bindingValue)
                                ? bindingContext['createChildContext'](ko.utils.unwrapObservable(bindingValue['data'])) // Given an explitit 'data' value, we create a child binding context for it
                                : bindingContext; // Given no explicit 'data' value, we retain the same binding context
                            templateSubscription = ko.renderTemplate(templateName || element, innerBindingContext, /* options: */ bindingValue, element);
                        } else
                            ko.virtualElements.emptyNode(element);
                    }

                    // It only makes sense to have a single template subscription per element (otherwise which one should have its output displayed?)
                    disposeOldSubscriptionAndStoreNewOne(element, templateSubscription);
                }
            };

            // Anonymous templates can't be rewritten. Give a nice error message if you try to do it.
            ko.jsonExpressionRewriting.bindingRewriteValidators['template'] = function(bindingValue) {
                var parsedBindingValue = ko.jsonExpressionRewriting.parseObjectLiteral(bindingValue);

                if ((parsedBindingValue.length == 1) && parsedBindingValue[0]['unknown'])
                    return null; // It looks like a string literal, not an object literal, so treat it as a named template (which is allowed for rewriting)

                if (ko.jsonExpressionRewriting.keyValueArrayContainsKey(parsedBindingValue, "name"))
                    return null; // Named templates can be rewritten, so return "no error"
                return "This template engine does not support anonymous templates nested within its templates";
            };

            ko.virtualElements.allowedBindings['template'] = true;
        })();

        ko.exportSymbol('setTemplateEngine', ko.setTemplateEngine);
        ko.exportSymbol('renderTemplate', ko.renderTemplate);

        (function() {
            // Simple calculation based on Levenshtein distance.

            function calculateEditDistanceMatrix(oldArray, newArray, maxAllowedDistance) {
                var distances = [];
                for (var i = 0; i <= newArray.length; i++)
                    distances[i] = [];

                // Top row - transform old array into empty array via deletions
                for (var i = 0, j = Math.min(oldArray.length, maxAllowedDistance); i <= j; i++)
                    distances[0][i] = i;

                // Left row - transform empty array into new array via additions
                for (var i = 1, j = Math.min(newArray.length, maxAllowedDistance); i <= j; i++) {
                    distances[i][0] = i;
                }

                // Fill out the body of the array
                var oldIndex, oldIndexMax = oldArray.length, newIndex, newIndexMax = newArray.length;
                var distanceViaAddition, distanceViaDeletion;
                for (oldIndex = 1; oldIndex <= oldIndexMax; oldIndex++) {
                    var newIndexMinForRow = Math.max(1, oldIndex - maxAllowedDistance);
                    var newIndexMaxForRow = Math.min(newIndexMax, oldIndex + maxAllowedDistance);
                    for (newIndex = newIndexMinForRow; newIndex <= newIndexMaxForRow; newIndex++) {
                        if (oldArray[oldIndex - 1] === newArray[newIndex - 1])
                            distances[newIndex][oldIndex] = distances[newIndex - 1][oldIndex - 1];
                        else {
                            var northDistance = distances[newIndex - 1][oldIndex] === undefined ? Number.MAX_VALUE : distances[newIndex - 1][oldIndex] + 1;
                            var westDistance = distances[newIndex][oldIndex - 1] === undefined ? Number.MAX_VALUE : distances[newIndex][oldIndex - 1] + 1;
                            distances[newIndex][oldIndex] = Math.min(northDistance, westDistance);
                        }
                    }
                }

                return distances;
            }

            function findEditScriptFromEditDistanceMatrix(editDistanceMatrix, oldArray, newArray) {
                var oldIndex = oldArray.length;
                var newIndex = newArray.length;
                var editScript = [];
                var maxDistance = editDistanceMatrix[newIndex][oldIndex];
                if (maxDistance === undefined)
                    return null; // maxAllowedDistance must be too small
                while ((oldIndex > 0) || (newIndex > 0)) {
                    var me = editDistanceMatrix[newIndex][oldIndex];
                    var distanceViaAdd = (newIndex > 0) ? editDistanceMatrix[newIndex - 1][oldIndex] : maxDistance + 1;
                    var distanceViaDelete = (oldIndex > 0) ? editDistanceMatrix[newIndex][oldIndex - 1] : maxDistance + 1;
                    var distanceViaRetain = (newIndex > 0) && (oldIndex > 0) ? editDistanceMatrix[newIndex - 1][oldIndex - 1] : maxDistance + 1;
                    if ((distanceViaAdd === undefined) || (distanceViaAdd < me - 1)) distanceViaAdd = maxDistance + 1;
                    if ((distanceViaDelete === undefined) || (distanceViaDelete < me - 1)) distanceViaDelete = maxDistance + 1;
                    if (distanceViaRetain < me - 1) distanceViaRetain = maxDistance + 1;

                    if ((distanceViaAdd <= distanceViaDelete) && (distanceViaAdd < distanceViaRetain)) {
                        editScript.push({ status: "added", value: newArray[newIndex - 1] });
                        newIndex--;
                    } else if ((distanceViaDelete < distanceViaAdd) && (distanceViaDelete < distanceViaRetain)) {
                        editScript.push({ status: "deleted", value: oldArray[oldIndex - 1] });
                        oldIndex--;
                    } else {
                        editScript.push({ status: "retained", value: oldArray[oldIndex - 1] });
                        newIndex--;
                        oldIndex--;
                    }
                }
                return editScript.reverse();
            }

            ko.utils.compareArrays = function(oldArray, newArray, maxEditsToConsider) {
                if (maxEditsToConsider === undefined) {
                    return ko.utils.compareArrays(oldArray, newArray, 1)                 // First consider likely case where there is at most one edit (very fast)
                        || ko.utils.compareArrays(oldArray, newArray, 10)                // If that fails, account for a fair number of changes while still being fast
                        || ko.utils.compareArrays(oldArray, newArray, Number.MAX_VALUE); // Ultimately give the right answer, even though it may take a long time
                } else {
                    oldArray = oldArray || [];
                    newArray = newArray || [];
                    var editDistanceMatrix = calculateEditDistanceMatrix(oldArray, newArray, maxEditsToConsider);
                    return findEditScriptFromEditDistanceMatrix(editDistanceMatrix, oldArray, newArray);
                }
            };
        })();

        ko.exportSymbol('utils.compareArrays', ko.utils.compareArrays);

        (function() {
            // Objective:
            // * Given an input array, a container DOM node, and a function from array elements to arrays of DOM nodes,
            //   map the array elements to arrays of DOM nodes, concatenate together all these arrays, and use them to populate the container DOM node
            // * Next time we're given the same combination of things (with the array possibly having mutated), update the container DOM node
            //   so that its children is again the concatenation of the mappings of the array elements, but don't re-map any array elements that we
            //   previously mapped - retain those nodes, and just insert/delete other ones

            // "callbackAfterAddingNodes" will be invoked after any "mapping"-generated nodes are inserted into the container node
            // You can use this, for example, to activate bindings on those nodes.

            function fixUpVirtualElements(contiguousNodeArray) {
                // Ensures that contiguousNodeArray really *is* an array of contiguous siblings, even if some of the interior
                // ones have changed since your array was first built (e.g., because your array contains virtual elements, and
                // their virtual children changed when binding was applied to them).
                // This is needed so that we can reliably remove or update the nodes corresponding to a given array item

                if (contiguousNodeArray.length > 2) {
                    // Build up the actual new contiguous node set
                    var current = contiguousNodeArray[0], last = contiguousNodeArray[contiguousNodeArray.length - 1], newContiguousSet = [current];
                    while (current !== last) {
                        current = current.nextSibling;
                        if (!current) // Won't happen, except if the developer has manually removed some DOM elements (then we're in an undefined scenario)
                            return;
                        newContiguousSet.push(current);
                    }

                    // ... then mutate the input array to match this.
                    // (The following line replaces the contents of contiguousNodeArray with newContiguousSet)
                    Array.prototype.splice.apply(contiguousNodeArray, [0, contiguousNodeArray.length].concat(newContiguousSet));
                }
            }

            function mapNodeAndRefreshWhenChanged(containerNode, mapping, valueToMap, callbackAfterAddingNodes, index) {
                // Map this array value inside a dependentObservable so we re-map when any dependency changes
                var mappedNodes = [];
                var dependentObservable = ko.dependentObservable(function() {
                    var newMappedNodes = mapping(valueToMap, index) || [];

                    // On subsequent evaluations, just replace the previously-inserted DOM nodes
                    if (mappedNodes.length > 0) {
                        fixUpVirtualElements(mappedNodes);
                        ko.utils.replaceDomNodes(mappedNodes, newMappedNodes);
                        if (callbackAfterAddingNodes)
                            callbackAfterAddingNodes(valueToMap, newMappedNodes);
                    }

                    // Replace the contents of the mappedNodes array, thereby updating the record
                    // of which nodes would be deleted if valueToMap was itself later removed
                    mappedNodes.splice(0, mappedNodes.length);
                    ko.utils.arrayPushAll(mappedNodes, newMappedNodes);
                }, null, { 'disposeWhenNodeIsRemoved': containerNode, 'disposeWhen': function() { return (mappedNodes.length == 0) || !ko.utils.domNodeIsAttachedToDocument(mappedNodes[0]); } });
                return { mappedNodes: mappedNodes, dependentObservable: dependentObservable };
            }

            var lastMappingResultDomDataKey = "setDomNodeChildrenFromArrayMapping_lastMappingResult";

            ko.utils.setDomNodeChildrenFromArrayMapping = function(domNode, array, mapping, options, callbackAfterAddingNodes) {
                // Compare the provided array against the previous one
                array = array || [];
                options = options || {};
                var isFirstExecution = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) === undefined;
                var lastMappingResult = ko.utils.domData.get(domNode, lastMappingResultDomDataKey) || [];
                var lastArray = ko.utils.arrayMap(lastMappingResult, function(x) { return x.arrayEntry; });
                var editScript = ko.utils.compareArrays(lastArray, array);

                // Build the new mapping result
                var newMappingResult = [];
                var lastMappingResultIndex = 0;
                var nodesToDelete = [];
                var newMappingResultIndex = 0;
                var nodesAdded = [];
                var insertAfterNode = null;
                for (var i = 0, j = editScript.length; i < j; i++) {
                    switch (editScript[i].status) {
                    case "retained":
                        // Just keep the information - don't touch the nodes
                        var dataToRetain = lastMappingResult[lastMappingResultIndex];
                        dataToRetain.indexObservable(newMappingResultIndex);
                        newMappingResultIndex = newMappingResult.push(dataToRetain);
                        if (dataToRetain.domNodes.length > 0)
                            insertAfterNode = dataToRetain.domNodes[dataToRetain.domNodes.length - 1];
                        lastMappingResultIndex++;
                        break;
                    case "deleted":
                        // Stop tracking changes to the mapping for these nodes
                        lastMappingResult[lastMappingResultIndex].dependentObservable.dispose();

                        // Queue these nodes for later removal
                        fixUpVirtualElements(lastMappingResult[lastMappingResultIndex].domNodes);
                        ko.utils.arrayForEach(lastMappingResult[lastMappingResultIndex].domNodes, function(node) {
                            nodesToDelete.push({
                                element: node,
                                index: i,
                                value: editScript[i].value
                            });
                            insertAfterNode = node;
                        });
                        lastMappingResultIndex++;
                        break;
                    case "added":
                        var valueToMap = editScript[i].value;
                        var indexObservable = ko.observable(newMappingResultIndex);
                        var mapData = mapNodeAndRefreshWhenChanged(domNode, mapping, valueToMap, callbackAfterAddingNodes, indexObservable);
                        var mappedNodes = mapData.mappedNodes;

                        // On the first evaluation, insert the nodes at the current insertion point
                        newMappingResultIndex = newMappingResult.push({
                            arrayEntry: editScript[i].value,
                            domNodes: mappedNodes,
                            dependentObservable: mapData.dependentObservable,
                            indexObservable: indexObservable
                        });
                        for (var nodeIndex = 0, nodeIndexMax = mappedNodes.length; nodeIndex < nodeIndexMax; nodeIndex++) {
                            var node = mappedNodes[nodeIndex];
                            nodesAdded.push({
                                element: node,
                                index: i,
                                value: editScript[i].value
                            });
                            if (insertAfterNode == null) {
                                // Insert "node" (the newly-created node) as domNode's first child
                                ko.virtualElements.prepend(domNode, node);
                            } else {
                                // Insert "node" into "domNode" immediately after "insertAfterNode"
                                ko.virtualElements.insertAfter(domNode, node, insertAfterNode);
                            }
                            insertAfterNode = node;
                        }
                        if (callbackAfterAddingNodes)
                            callbackAfterAddingNodes(valueToMap, mappedNodes, indexObservable);
                        break;
                    }
                }

                ko.utils.arrayForEach(nodesToDelete, function(node) { ko.cleanNode(node.element); });

                var invokedBeforeRemoveCallback = false;
                if (!isFirstExecution) {
                    if (options['afterAdd']) {
                        for (var i = 0; i < nodesAdded.length; i++)
                            options['afterAdd'](nodesAdded[i].element, nodesAdded[i].index, nodesAdded[i].value);
                    }
                    if (options['beforeRemove']) {
                        for (var i = 0; i < nodesToDelete.length; i++)
                            options['beforeRemove'](nodesToDelete[i].element, nodesToDelete[i].index, nodesToDelete[i].value);
                        invokedBeforeRemoveCallback = true;
                    }
                }
                if (!invokedBeforeRemoveCallback && nodesToDelete.length) {
                    for (var i = 0; i < nodesToDelete.length; i++) {
                        var element = nodesToDelete[i].element;
                        if (element.parentNode)
                            element.parentNode.removeChild(element);
                    }
                }

                // Store a copy of the array items we just considered so we can difference it next time
                ko.utils.domData.set(domNode, lastMappingResultDomDataKey, newMappingResult);
            };
        })();

        ko.exportSymbol('utils.setDomNodeChildrenFromArrayMapping', ko.utils.setDomNodeChildrenFromArrayMapping);
        ko.nativeTemplateEngine = function() {
            this['allowTemplateRewriting'] = false;
        };
        ko.nativeTemplateEngine.prototype = new ko.templateEngine();
        ko.nativeTemplateEngine.prototype['renderTemplateSource'] = function(templateSource, bindingContext, options) {
            var useNodesIfAvailable = !(ko.utils.ieVersion < 9), // IE<9 cloneNode doesn't work properly
                templateNodesFunc = useNodesIfAvailable ? templateSource['nodes'] : null,
                templateNodes = templateNodesFunc ? templateSource['nodes']() : null;

            if (templateNodes) {
                return ko.utils.makeArray(templateNodes.cloneNode(true).childNodes);
            } else {
                var templateText = templateSource['text']();
                return ko.utils.parseHtmlFragment(templateText);
            }
        };

        ko.nativeTemplateEngine.instance = new ko.nativeTemplateEngine();
        ko.setTemplateEngine(ko.nativeTemplateEngine.instance);

        ko.exportSymbol('nativeTemplateEngine', ko.nativeTemplateEngine);
        (function() {
            ko.jqueryTmplTemplateEngine = function() {
                // Detect which version of jquery-tmpl you're using. Unfortunately jquery-tmpl
                // doesn't expose a version number, so we have to infer it.
                // Note that as of Knockout 1.3, we only support jQuery.tmpl 1.0.0pre and later,
                // which KO internally refers to as version "2", so older versions are no longer detected.
                var jQueryTmplVersion = this.jQueryTmplVersion = (function() {
                    if ((typeof(jQuery) == "undefined") || !(jQuery['tmpl']))
                        return 0;
                    // Since it exposes no official version number, we use our own numbering system. To be updated as jquery-tmpl evolves.
                    try {
                        if (jQuery['tmpl']['tag']['tmpl']['open'].toString().indexOf('__') >= 0) {
                            // Since 1.0.0pre, custom tags should append markup to an array called "__"
                            return 2; // Final version of jquery.tmpl
                        }
                    } catch(ex) { /* Apparently not the version we were looking for */
                    }

                    return 1; // Any older version that we don't support
                })();

                function ensureHasReferencedJQueryTemplates() {
                    if (jQueryTmplVersion < 2)
                        throw new Error("Your version of jQuery.tmpl is too old. Please upgrade to jQuery.tmpl 1.0.0pre or later.");
                }

                function executeTemplate(compiledTemplate, data, jQueryTemplateOptions) {
                    return jQuery['tmpl'](compiledTemplate, data, jQueryTemplateOptions);
                }

                this['renderTemplateSource'] = function(templateSource, bindingContext, options) {
                    options = options || {};
                    ensureHasReferencedJQueryTemplates();

                    // Ensure we have stored a precompiled version of this template (don't want to reparse on every render)
                    var precompiled = templateSource['data']('precompiled');
                    if (!precompiled) {
                        var templateText = templateSource['text']() || "";
                        // Wrap in "with($whatever.koBindingContext) { ... }"
                        templateText = "{{ko_with $item.koBindingContext}}" + templateText + "{{/ko_with}}";

                        precompiled = jQuery['template'](null, templateText);
                        templateSource['data']('precompiled', precompiled);
                    }

                    var data = [bindingContext['$data']]; // Prewrap the data in an array to stop jquery.tmpl from trying to unwrap any arrays
                    var jQueryTemplateOptions = jQuery['extend']({ 'koBindingContext': bindingContext }, options['templateOptions']);

                    var resultNodes = executeTemplate(precompiled, data, jQueryTemplateOptions);
                    resultNodes['appendTo'](document.createElement("div")); // Using "appendTo" forces jQuery/jQuery.tmpl to perform necessary cleanup work

                    jQuery['fragments'] = {}; // Clear jQuery's fragment cache to avoid a memory leak after a large number of template renders
                    return resultNodes;
                };

                this['createJavaScriptEvaluatorBlock'] = function(script) {
                    return "{{ko_code ((function() { return " + script + " })()) }}";
                };

                this['addTemplate'] = function(templateName, templateMarkup) {
                    document.write("<script type='text/html' id='" + templateName + "'>" + templateMarkup + "</script>");
                };

                if (jQueryTmplVersion > 0) {
                    jQuery['tmpl']['tag']['ko_code'] = {
                        open: "__.push($1 || '');"
                    };
                    jQuery['tmpl']['tag']['ko_with'] = {
                        open: "with($1) {",
                        close: "} "
                    };
                }
            };

            ko.jqueryTmplTemplateEngine.prototype = new ko.templateEngine();

            // Use this one by default *only if jquery.tmpl is referenced*
            var jqueryTmplTemplateEngineInstance = new ko.jqueryTmplTemplateEngine();
            if (jqueryTmplTemplateEngineInstance.jQueryTmplVersion > 0)
                ko.setTemplateEngine(jqueryTmplTemplateEngineInstance);

            ko.exportSymbol('jqueryTmplTemplateEngine', ko.jqueryTmplTemplateEngine);
        })();
    });
})(window, document, navigator);