diff --git a/README.md b/README.md
index 5b9b59244..fec0ea79e 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,7 @@ For more information check out these screencasts over Lo-Dash:
  * [_.merge](http://lodash.com/docs#merge) for a *“deep”* [_.extend](http://lodash.com/docs#extend)
  * [_.partial](http://lodash.com/docs#partial) for partial application without `this` binding
  * [_.pick](http://lodash.com/docs#pick) and [_.omit](http://lodash.com/docs#omit) accepts `callback` and `thisArg` arguments
- * [_.template](http://lodash.com/docs#template) supports [ES6 delimiters](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6) and utilizes [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) for easier debugging
+ * [_.template](http://lodash.com/docs#template) supports [ES6 template delimiters](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6) and utilizes [sourceURLs](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) for easier debugging
  * [_.contains](http://lodash.com/docs#contains), [_.size](http://lodash.com/docs#size), [_.toArray](http://lodash.com/docs#toArray),
    [and more…](http://lodash.com/docs "_.countBy, _.every, _.filter, _.find, _.forEach, _.groupBy, _.invoke, _.map, _.max, _.min, _.pluck, _.reduce, _.reduceRight, _.reject, _.shuffle, _.some, _.sortBy, _.where") accept strings
 
@@ -230,7 +230,7 @@ require({
 
 #### Compatibility Warnings ####
 
- * Aligned `_.defaults` and `_.extend` with ES6 [Object.assign](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.2.3.15)
+ * Made `_.defaults` and `_.extend` iterate only own properties of `source` objects to align with [ES6 `Object.assign`](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.2.3.15)
  * Renamed `_.lateBind` to `_.bindKey`
 
 #### Changes ####
diff --git a/build.js b/build.js
index f66c4db0d..2c9abe3ce 100755
--- a/build.js
+++ b/build.js
@@ -149,7 +149,7 @@
     'template': ['escape'],
     'throttle': [],
     'times': [],
-    'toArray': ['values'],
+    'toArray': ['isString', 'values'],
     'unescape': [],
     'union': ['uniq'],
     'uniq': ['identity', 'indexOf'],
@@ -1614,21 +1614,28 @@
           .replace(/ *\(function\(\) *{[\s\S]+?}\(1\)\);\n/, '')
           .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var (?:hasDontEnumBug|iteratesOwnLast|noArgsEnum).+\n/g, '');
 
-        // remove `iteratesOwnLast` from `isPlainObject`
-        source = source.replace(/(?:\s*\/\/.*)*\n( *)if *\(iteratesOwnLast[\s\S]+?\n\1}/, '');
-
         // remove JScript [[DontEnum]] fix from `_.isEqual`
-        source = source.replace(/(?:\s*\/\/.*)*\n( *)if *\(hasDontEnumBug[\s\S]+?\n\1}/, '');
+        source = source.replace(matchFunction(source, 'isEqual'), function(match) {
+          return match.replace(/(?:\s*\/\/.*)*\n( *)if *\(hasDontEnumBug[\s\S]+?\n\1}/, '');
+        });
 
-        // remove `noArraySliceOnStrings` from `_.toArray`
-        source = source.replace(/noArraySliceOnStrings *\?[^:]+: *([^)]+)/g, '$1');
+        // remove `iteratesOwnLast` from `isPlainObject`
+        source = source.replace(matchFunction(source, 'isPlainObject'), function(match) {
+          return match.replace(/(?:\s*\/\/.*)*\n( *)if *\(iteratesOwnLast[\s\S]+?\n\1}/, '');
+        });
 
         // remove `noCharByIndex` from `_.reduceRight`
-        source = source.replace(/}\s*else if *\(noCharByIndex[^}]+/, '');
+        source = source.replace(matchFunction(source, 'reduceRight'), function(match) {
+          return match.replace(/}\s*else if *\(noCharByIndex[^}]+/, '');
+        });
+
+        // remove `noCharByIndex` from `_.toArray`
+        source = source.replace(matchFunction(source, 'toArray'), function(match) {
+          return match.replace(/(?:\s*\/\/.*)*\n( *)if *\(noCharByIndex[\s\S]+?\n\1}/, '');
+        });
 
         source = removeVar(source, 'extendIteratorOptions');
         source = removeVar(source, 'iteratorTemplate');
-        source = removeVar(source, 'noArraySliceOnStrings');
         source = removeVar(source, 'noCharByIndex');
         source = removeNoArgsClass(source);
         source = removeNoNodeClass(source);
@@ -1764,9 +1771,6 @@
         // remove `templateSettings` assignment
         source = source.replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *lodash\.templateSettings[\s\S]+?};\n/, '');
       }
-      if (isRemoved(source, 'toArray')) {
-        source = removeVar(source, 'noArraySliceOnStrings');
-      }
       if (isRemoved(source, 'clone', 'isArguments', 'isEmpty', 'isEqual')) {
         source = removeNoArgsClass(source);
       }
diff --git a/build/post-install.js b/build/post-install.js
index 28f008b01..9656f5af4 100644
--- a/build/post-install.js
+++ b/build/post-install.js
@@ -99,22 +99,28 @@
   /*--------------------------------------------------------------------------*/
 
   exec('npm -g root', function(exception, stdout) {
+    if (!exception) {
+      try {
+        var isGlobal = path.resolve(basePath, '..') == fs.realpathSync(stdout.trim());
+      } catch(e) {
+        exception = e;
+      }
+    }
     if (exception) {
       console.error([
-        'There was a problem loading the npm registry. If you’re installing the Lo-Dash',
-        'command-line executable (via `npm install -g lodash`), you’ll need to manually',
-        'install UglifyJS and the Closure Compiler by running:',
+        'Oops! There was a problem detecting the install mode. If you’re installing the',
+        'Lo-Dash command-line executable (via `npm install -g lodash`), you’ll need to',
+        'manually install UglifyJS and the Closure Compiler by running:',
         '',
         "curl -H 'Accept: " + mediaType + "' " + location.href + '/' + closureId + " | tar xvz -C '" + vendorPath + "'",
         "curl -H 'Accept: " + mediaType + "' " + location.href + '/' + uglifyId  + " | tar xvz -C '" + vendorPath + "'",
         '',
-        'Please submit an issue on the GitHub issue tracker: ' + process.env.npm_package_bugs_url + '.'
+        'Please submit an issue on the GitHub issue tracker: ' + process.env.npm_package_bugs_url
       ].join('\n'));
+
       console.error(exception);
-      process.exit();
     }
-    // exit early if not a global install
-    if (path.resolve(basePath, '..') != fs.realpathSync(stdout.trim())) {
+    if (!isGlobal) {
       return;
     }
     // download the Closure Compiler
diff --git a/doc/README.md b/doc/README.md
index 0092d66ae..eddb93472 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -39,8 +39,7 @@
 * [`_.chain`](#_chainvalue)
 * [`_.tap`](#_tapvalue-interceptor)
 * [`_.prototype.chain`](#_prototypechain)
-* [`_.prototype.toString`](#_prototypetostring)
-* [`_.prototype.valueOf`](#_prototypevalueof)
+* [`_.prototype.value`](#_prototypevalue)
 
 <!-- /div -->
 
@@ -698,7 +697,7 @@ The `lodash` function.
 <!-- div -->
 
 ### <a id="_chainvalue"></a>`_.chain(value)`
-<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3999 "View in source") [&#x24C9;][1]
+<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4003 "View in source") [&#x24C9;][1]
 
 Wraps the value in a `lodash` wrapper object.
 
@@ -732,7 +731,7 @@ var youngest = _.chain(stooges)
 <!-- div -->
 
 ### <a id="_tapvalue-interceptor"></a>`_.tap(value, interceptor)`
-<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4024 "View in source") [&#x24C9;][1]
+<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4030 "View in source") [&#x24C9;][1]
 
 Invokes `interceptor` with the `value` as the first argument, and then returns `value`. The purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
 
@@ -762,9 +761,9 @@ _.chain([1, 2, 3, 200])
 <!-- div -->
 
 ### <a id="_prototypechain"></a>`_.prototype.chain()`
-<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4046 "View in source") [&#x24C9;][1]
+<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4048 "View in source") [&#x24C9;][1]
 
-This function returns the wrapper object.  Note: This function is defined to ensure the existing wrapper object is returned, instead of creating a new wrapper object like the `_.chain` method does.
+Enables method chaining on the wrapper object.
 
 #### Returns
 *(Mixed)*: Returns the wrapper object.
@@ -782,29 +781,8 @@ _([1, 2, 3]).value();
 
 <!-- div -->
 
-### <a id="_prototypetostring"></a>`_.prototype.toString()`
-<a href="#_prototypetostring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4062 "View in source") [&#x24C9;][1]
-
-Produces the `toString` result of the wrapped value.
-
-#### Returns
-*(String)*: Returns the string result.
-
-#### Example
-```js
-_([1, 2, 3]).toString();
-// => '1,2,3'
-```
-
-* * *
-
-<!-- /div -->
-
-
-<!-- div -->
-
-### <a id="_prototypevalueof"></a>`_.prototype.valueOf()`
-<a href="#_prototypevalueof">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4078 "View in source") [&#x24C9;][1]
+### <a id="_prototypevalue"></a>`_.prototype.value()`
+<a href="#_prototypevalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4065 "View in source") [&#x24C9;][1]
 
 Extracts the wrapped value.
 
@@ -2799,7 +2777,7 @@ _('curly').capitalize();
 <!-- div -->
 
 ### <a id="_noconflict"></a>`_.noConflict()`
-<a href="#_noconflict">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3656 "View in source") [&#x24C9;][1]
+<a href="#_noconflict">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3660 "View in source") [&#x24C9;][1]
 
 Reverts the '_' variable to its previous value and returns a reference to the `lodash` function.
 
@@ -2819,7 +2797,7 @@ var lodash = _.noConflict();
 <!-- div -->
 
 ### <a id="_randommin0-max1"></a>`_.random([min=0, max=1])`
-<a href="#_randommin0-max1">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3679 "View in source") [&#x24C9;][1]
+<a href="#_randommin0-max1">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3683 "View in source") [&#x24C9;][1]
 
 Produces a random number between `min` and `max` *(inclusive)*. If only one argument is passed, a number between `0` and the given number will be returned.
 
@@ -2847,7 +2825,7 @@ _.random(5);
 <!-- div -->
 
 ### <a id="_resultobject-property"></a>`_.result(object, property)`
-<a href="#_resultobject-property">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3717 "View in source") [&#x24C9;][1]
+<a href="#_resultobject-property">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3721 "View in source") [&#x24C9;][1]
 
 Resolves the value of `property` on `object`. If `property` is a function it will be invoked and its result returned, else the property value is returned. If `object` is falsey, then `null` is returned.
 
@@ -2882,7 +2860,7 @@ _.result(object, 'stuff');
 <!-- div -->
 
 ### <a id="_templatetext-data-options"></a>`_.template(text, data, options)`
-<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3802 "View in source") [&#x24C9;][1]
+<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3806 "View in source") [&#x24C9;][1]
 
 A micro-templating method that handles arbitrary delimiters, preserves whitespace, and correctly escapes quotes within interpolated code.  Note: In the development build `_.template` utilizes sourceURLs for easier debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl  Note: Lo-Dash may be used in Chrome extensions by either creating a `lodash csp` build and avoiding `_.template` use, or loading Lo-Dash in a sandboxed page. See http://developer.chrome.com/trunk/extensions/sandboxingEval.html
 
@@ -2956,7 +2934,7 @@ fs.writeFileSync(path.join(cwd, 'jst.js'), '\
 <!-- div -->
 
 ### <a id="_timesn-callback--thisarg"></a>`_.times(n, callback [, thisArg])`
-<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3925 "View in source") [&#x24C9;][1]
+<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3929 "View in source") [&#x24C9;][1]
 
 Executes the `callback` function `n` times, returning an array of the results of each `callback` execution. The `callback` is bound to `thisArg` and invoked with one argument; *(index)*.
 
@@ -2988,7 +2966,7 @@ _.times(3, function(n) { this.cast(n); }, mage);
 <!-- div -->
 
 ### <a id="_unescapestring"></a>`_.unescape(string)`
-<a href="#_unescapestring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3951 "View in source") [&#x24C9;][1]
+<a href="#_unescapestring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3955 "View in source") [&#x24C9;][1]
 
 The opposite of `_.escape`, this method converts the HTML entities `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#x27;` in `string` to their corresponding characters.
 
@@ -3012,7 +2990,7 @@ _.unescape('Moe, Larry &amp; Curly');
 <!-- div -->
 
 ### <a id="_uniqueidprefix"></a>`_.uniqueId([prefix])`
-<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3969 "View in source") [&#x24C9;][1]
+<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3973 "View in source") [&#x24C9;][1]
 
 Generates a unique id. If `prefix` is passed, the id will be appended to it.
 
@@ -3043,7 +3021,7 @@ _.uniqueId('contact_');
 <!-- div -->
 
 ### <a id="_version"></a>`_.VERSION`
-<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4091 "View in source") [&#x24C9;][1]
+<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4078 "View in source") [&#x24C9;][1]
 
 *(String)*: The semantic version number.
 
diff --git a/lodash.js b/lodash.js
index 58d1e9fd6..b1e3eeb39 100644
--- a/lodash.js
+++ b/lodash.js
@@ -157,9 +157,6 @@
   /** Detect if an `arguments` object's [[Class]] is unresolvable (Firefox < 4, IE < 9) */
   var noArgsClass = !isArguments(arguments);
 
-  /** Detect if `Array#slice` cannot be used to convert strings to arrays (Opera < 10.52) */
-  var noArraySliceOnStrings = slice.call('x')[0] != 'x';
-
   /**
    * Detect lack of support for accessing string characters by index:
    *
@@ -2510,10 +2507,18 @@
    * // => [2, 3, 4]
    */
   function toArray(collection) {
-    if (collection && typeof collection.length == 'number') {
-      return (noArraySliceOnStrings ? isString(collection) : typeof collection == 'string')
-        ? collection.split('')
-        : slice.call(collection);
+    var length = collection ? collection.length : 0;
+    if (typeof length == 'number') {
+      if (noCharByIndex && isString(collection)) {
+        collection = collection.split('');
+      }
+      var index = -1,
+          result = Array(length);
+
+      while (++index < length) {
+        result[index] = collection[index];
+      }
+      return result;
     }
     return values(collection);
   }
diff --git a/lodash.min.js b/lodash.min.js
index f467c72dd..2fcb4242c 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -3,38 +3,38 @@
  Underscore.js 1.4.2 underscorejs.org/LICENSE
 */
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-(e,t,n){function r(){var u=arguments,a=s?this:t;return i||(e=t[o]),n.length&&(u=u.length?n.concat(St.call(u)):n),this instanceof r?(d.prototype=e.prototype,a=new d,u=e.apply(a,u),T(u)?u:a):e.apply(a,u)}var i=x(e),s=!n,o=t;return s&&(n=t),i||(t=e),r}function l(e,n){return e?"function"!=typeof e?function(t){return t[e]}:n!==t?function(t,r,i){return e.call(n,t,r,i)}:e:X}function c(){for(var e={b:"",c:"",e:qt,f:Qt,g:"",h:zt,i:Vt,j:dt,k:"",l:n},t,r=0;t=arguments[r];r++)for(var i in t)e[i]=t[i];t=e.a,e
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diff --git a/lodash.underscore.min.js b/lodash.underscore.min.js
index c858ed812..420fd4307 100644
--- a/lodash.underscore.min.js
+++ b/lodash.underscore.min.js
@@ -26,7 +26,7 @@ at(n,r-1))+1);r--;)if(e[r]===t)return r;return-1},n.map=T,n.max=N,n.memoize=func
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 function(e){var t=e?e.length:0;return"number"==typeof t?t:Ct(e).length},n.some=A,n.sortBy=function(e,t,n){var i=[],t=s(t,n);kt(e,function(e,n,r){i.push({a:t(e,n,r),b:n,c:e})}),e=i.length;for(i.sort(r);e--;)i[e]=i[e].c;return i},n.sortedIndex=P,n.tap=function(e,t){return t(e),e},n.template=function(e,t,r){e||(e="");var r=h({},r,n.templateSettings),i=0,s="__p += '",u=r.variable;e.replace(RegExp((r.escape||$).source+"|"+(r.interpolate||$).source+"|"+(r.evaluate||$).source+"|$","g"),function(t,n,r,u,
 a){s+=e.slice(i,a).replace(K,o),s+=n?"'+_['escape']("+n+")+'":u?"';"+u+";__p+='":r?"'+((__t=("+r+"))==null?'':__t)+'":"",i=a+t.length}),s+="';",u||(u="obj",s="with("+u+"||{}){"+s+"}"),s="function("+u+"){var __t,__p='',__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+s+"return __p}";try{var a=Function("_","return "+s)(n)}catch(f){throw f.source=s,f}return t?a(t):(a.source=s,a)},n.throttle=function(e,t){function n(){u=new Date,o=null,i=e.apply(s,r)}var r,i,s,o,u=0;return function(
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+,"join","slice"],function(e){var t=R[e];n.prototype[e]=function(){var e=t.apply(this.__wrapped__,arguments);return this.__chain__&&(e=new n(e),e.__chain__=!0),e}}),I?"object"==typeof module&&module&&module.exports==I?(module.exports=n)._=n:I._=n:e._=n})(this);
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diff --git a/test/test.js b/test/test.js
index 3986e8d6d..d7621fe19 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1782,6 +1782,19 @@
       deepEqual(_.toArray('abc'), ['a', 'b', 'c']);
       deepEqual(_.toArray(Object('abc')), ['a', 'b', 'c']);
     });
+
+    test('should work with a NodeList for `collection` (test in IE < 9)', function() {
+      if (window.document) {
+        try {
+          var nodeList = document.getElementsByTagName('body'),
+              body = nodeList[0],
+              actual = _.toArray(nodeList);
+        } catch(e) { }
+        deepEqual(actual, [body]);
+      } else {
+        skipTest();
+      }
+    });
   }(1, 2, 3));
 
   /*--------------------------------------------------------------------------*/
diff --git a/vendor/backbone/backbone.js b/vendor/backbone/backbone.js
index 50deb5922..a6dee3092 100644
--- a/vendor/backbone/backbone.js
+++ b/vendor/backbone/backbone.js
@@ -367,7 +367,7 @@
 
       // If we're "wait"-ing to set changed attributes, validate early.
       if (options.wait) {
-        if (!this._validate(attrs, options)) return false;
+        if (attrs && !this._validate(attrs, options)) return false;
         current = _.clone(this.attributes);
       }
 
@@ -1204,7 +1204,7 @@
   var delegateEventSplitter = /^(\S+)\s*(.*)$/;
 
   // List of view options to be merged as properties.
-  var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName'];
+  var viewOptions = ['model', 'collection', 'el', 'id', 'attributes', 'className', 'tagName', 'events'];
 
   // Set up all inheritable **Backbone.View** properties and methods.
   _.extend(View.prototype, Events, {
diff --git a/vendor/backbone/test/model.js b/vendor/backbone/test/model.js
index c962de4b7..38197531e 100644
--- a/vendor/backbone/test/model.js
+++ b/vendor/backbone/test/model.js
@@ -99,7 +99,7 @@ $(document).ready(function() {
     equal(model.url(), '/nested/1/collection/2');
   });
 
-  test("clone", 8, function() {
+  test("clone", 10, function() {
     var a = new Backbone.Model({ 'foo': 1, 'bar': 2, 'baz': 3});
     var b = a.clone();
     equal(a.get('foo'), 1);
@@ -111,6 +111,12 @@ $(document).ready(function() {
     a.set({foo : 100});
     equal(a.get('foo'), 100);
     equal(b.get('foo'), 1, "Changing a parent attribute does not change the clone.");
+
+    var foo = new Backbone.Model({p: 1});
+    var bar = new Backbone.Model({p: 2});
+    bar.set(foo.clone(), {unset: true});
+    equal(foo.get('p'), 1);
+    equal(bar.get('p'), undefined);
   });
 
   test("isNew", 6, function() {
diff --git a/vendor/backbone/test/view.js b/vendor/backbone/test/view.js
index 9fa56ad14..fa0a97433 100644
--- a/vendor/backbone/test/view.js
+++ b/vendor/backbone/test/view.js
@@ -331,4 +331,28 @@ $(document).ready(function() {
     ok(view.$el.is('p:has(a)'));
   });
 
+  test("events passed in options", 2, function() {
+    var counter = 0;
+
+    var View = Backbone.View.extend({
+      el: '<p><a id="test"></a></p>',
+      increment: function() {
+        counter++;
+      }
+    });
+    
+    var view = new View({events:{'click #test':'increment'}});
+    var view2 = new View({events:function(){
+      return {'click #test':'increment'};
+    }});
+    
+    view.$('#test').trigger('click');
+    view2.$('#test').trigger('click');
+    equal(counter, 2);
+    
+    view.$('#test').trigger('click');
+    view2.$('#test').trigger('click');
+    equal(counter, 4);
+  });
+
 });
diff --git a/vendor/underscore/test/collections.js b/vendor/underscore/test/collections.js
index 32e27f2fc..2e684056f 100644
--- a/vendor/underscore/test/collections.js
+++ b/vendor/underscore/test/collections.js
@@ -348,6 +348,11 @@ $(document).ready(function() {
 
     var array = [{}];
     _.groupBy(array, function(value, index, obj){ ok(obj === array); });
+
+    var array = [1, 2, 1, 2, 3];
+    var grouped = _.groupBy(array);
+    equal(grouped['1'].length, 2);
+    equal(grouped['3'].length, 1);
   });
 
   test('countBy', function() {
@@ -372,6 +377,11 @@ $(document).ready(function() {
 
     var array = [{}];
     _.countBy(array, function(value, index, obj){ ok(obj === array); });
+
+    var array = [1, 2, 1, 2, 3];
+    var grouped = _.countBy(array);
+    equal(grouped['1'], 2);
+    equal(grouped['3'], 1);
   });
 
   test('sortedIndex', function() {
diff --git a/vendor/underscore/underscore-min.js b/vendor/underscore/underscore-min.js
index 7d1b612d8..b1f973ff0 100644
--- a/vendor/underscore/underscore-min.js
+++ b/vendor/underscore/underscore-min.js
@@ -2,4 +2,4 @@
 //     http://underscorejs.org
 //     (c) 2009-2012 Jeremy Ashkenas, DocumentCloud Inc.
 //     Underscore may be freely distributed under the MIT license.
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diff --git a/vendor/underscore/underscore.js b/vendor/underscore/underscore.js
index e51851404..3771cb422 100644
--- a/vendor/underscore/underscore.js
+++ b/vendor/underscore/underscore.js
@@ -316,7 +316,7 @@
   // An internal function used for aggregate "group by" operations.
   var group = function(obj, value, context, behavior) {
     var result = {};
-    var iterator = lookupIterator(value);
+    var iterator = lookupIterator(value || _.identity);
     each(obj, function(value, index) {
       var key = iterator.call(context, value, index, obj);
       behavior(result, key, value);