diff --git a/bower.json b/bower.json
index a53714ccb..38f3d3e75 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,6 @@
 {
   "name": "underscore",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "main": "underscore.js",
   "keywords": ["util", "functional", "server", "client", "browser"],
   "ignore" : ["docs", "test", "*.yml", "CNAME", "index.html", "favicon.ico", "CONTRIBUTING.md"]
diff --git a/component.json b/component.json
index 760a1da01..9a2d5a267 100644
--- a/component.json
+++ b/component.json
@@ -5,6 +5,6 @@
   "repo"          : "jashkenas/underscore",
   "main"          : "underscore.js",
   "scripts"       : ["underscore.js"],
-  "version"       : "1.8.0",
+  "version"       : "1.8.1",
   "license"       : "MIT"
 }
diff --git a/docs/underscore.html b/docs/underscore.html
index 0cbfad36c..726cc10ef 100644
--- a/docs/underscore.html
+++ b/docs/underscore.html
@@ -27,7 +27,7 @@ <h1>underscore.js</h1>
               <div class="pilwrap ">
                 <a class="pilcrow" href="#section-1">&#182;</a>
               </div>
-              <pre><code>Underscore.js <span class="hljs-number">1.8</span><span class="hljs-number">.0</span>
+              <pre><code>Underscore.js <span class="hljs-number">1.8</span><span class="hljs-number">.1</span>
 http:<span class="hljs-comment">//underscorejs.org</span>
 (c) <span class="hljs-number">2009</span>-<span class="hljs-number">2015</span> Jeremy Ashkenas, DocumentCloud and Investigative Reporters &amp; Editors
 Underscore may be freely distributed under the MIT license.
@@ -155,7 +155,7 @@ <h2 id="baseline-setup">Baseline setup</h2>
               <div class="pilwrap ">
                 <a class="pilcrow" href="#section-9">&#182;</a>
               </div>
-              <p>Reusable constructor function for prototype setting.</p>
+              <p>Naked function reference for surrogate-prototype-swapping.</p>
 
             </div>
             
@@ -217,7 +217,7 @@ <h2 id="baseline-setup">Baseline setup</h2>
 
             </div>
             
-            <div class="content"><div class='highlight'><pre>  _.VERSION = <span class="hljs-string">'1.8.0'</span>;</pre></div></div>
+            <div class="content"><div class='highlight'><pre>  _.VERSION = <span class="hljs-string">'1.8.1'</span>;</pre></div></div>
             
         </li>
         
@@ -1620,9 +1620,10 @@ <h2 id="function-ahem-functions">Function (ahem) Functions</h2>
     <span class="hljs-keyword">if</span> (nativeBind &amp;&amp; func.bind === nativeBind) <span class="hljs-keyword">return</span> nativeBind.apply(func, slice.call(<span class="hljs-built_in">arguments</span>, <span class="hljs-number">1</span>));
     <span class="hljs-keyword">if</span> (!_.isFunction(func)) <span class="hljs-keyword">throw</span> <span class="hljs-keyword">new</span> <span class="hljs-built_in">TypeError</span>(<span class="hljs-string">'Bind must be called on a function'</span>);
     <span class="hljs-keyword">var</span> args = slice.call(<span class="hljs-built_in">arguments</span>, <span class="hljs-number">2</span>);
-    <span class="hljs-keyword">return</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">bound</span><span class="hljs-params">()</span> </span>{
+    <span class="hljs-keyword">var</span> bound = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
       <span class="hljs-keyword">return</span> executeBound(func, bound, context, <span class="hljs-keyword">this</span>, args.concat(slice.call(<span class="hljs-built_in">arguments</span>)));
     };
+    <span class="hljs-keyword">return</span> bound;
   };</pre></div></div>
             
         </li>
@@ -1642,7 +1643,7 @@ <h2 id="function-ahem-functions">Function (ahem) Functions</h2>
             
             <div class="content"><div class='highlight'><pre>  _.partial = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(func)</span> </span>{
     <span class="hljs-keyword">var</span> boundArgs = slice.call(<span class="hljs-built_in">arguments</span>, <span class="hljs-number">1</span>);
-    <span class="hljs-keyword">return</span> <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">bound</span><span class="hljs-params">()</span> </span>{
+    <span class="hljs-keyword">var</span> bound = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">()</span> </span>{
       <span class="hljs-keyword">var</span> position = <span class="hljs-number">0</span>, length = boundArgs.length;
       <span class="hljs-keyword">var</span> args = <span class="hljs-built_in">Array</span>(length);
       <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; length; i++) {
@@ -1651,6 +1652,7 @@ <h2 id="function-ahem-functions">Function (ahem) Functions</h2>
       <span class="hljs-keyword">while</span> (position &lt; <span class="hljs-built_in">arguments</span>.length) args.push(<span class="hljs-built_in">arguments</span>[position++]);
       <span class="hljs-keyword">return</span> executeBound(func, bound, <span class="hljs-keyword">this</span>, <span class="hljs-keyword">this</span>, args);
     };
+    <span class="hljs-keyword">return</span> bound;
   };</pre></div></div>
             
         </li>
@@ -1994,36 +1996,6 @@ <h2 id="object-functions">Object Functions</h2>
               <div class="pilwrap ">
                 <a class="pilcrow" href="#section-91">&#182;</a>
               </div>
-              <p>Keys in IE &lt; 9 that won’t be iterated by <code>for key in ...</code> and thus missed.</p>
-
-            </div>
-            
-            <div class="content"><div class='highlight'><pre>  <span class="hljs-keyword">var</span> hasEnumBug = !{toString: <span class="hljs-literal">null</span>}.propertyIsEnumerable(<span class="hljs-string">'toString'</span>);
-  <span class="hljs-keyword">var</span> nonEnumerableProps = [<span class="hljs-string">'constructor'</span>, <span class="hljs-string">'valueOf'</span>, <span class="hljs-string">'isPrototypeOf'</span>, <span class="hljs-string">'toString'</span>,
-                      <span class="hljs-string">'propertyIsEnumerable'</span>, <span class="hljs-string">'hasOwnProperty'</span>, <span class="hljs-string">'toLocaleString'</span>];
-
-  <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">collectNonEnumProps</span><span class="hljs-params">(obj, keys)</span> </span>{
-    <span class="hljs-keyword">var</span> nonEnumIdx = nonEnumerableProps.length;
-    <span class="hljs-keyword">var</span> proto = <span class="hljs-keyword">typeof</span> obj.constructor === <span class="hljs-string">'function'</span> ? FuncProto : ObjProto;
-
-    <span class="hljs-keyword">while</span> (nonEnumIdx--) {
-      <span class="hljs-keyword">var</span> prop = nonEnumerableProps[nonEnumIdx];
-      <span class="hljs-keyword">if</span> (prop === <span class="hljs-string">'constructor'</span> ? _.has(obj, prop) : prop <span class="hljs-keyword">in</span> obj &amp;&amp;
-        obj[prop] !== proto[prop] &amp;&amp; !_.contains(keys, prop)) {
-        keys.push(prop);
-      }
-    }
-  }</pre></div></div>
-            
-        </li>
-        
-        
-        <li id="section-92">
-            <div class="annotation">
-              
-              <div class="pilwrap ">
-                <a class="pilcrow" href="#section-92">&#182;</a>
-              </div>
               <p>Retrieve the names of an object’s own properties.
 Delegates to <strong>ECMAScript 5</strong>‘s native <code>Object.keys</code></p>
 
@@ -2033,33 +2005,18 @@ <h2 id="object-functions">Object Functions</h2>
     <span class="hljs-keyword">if</span> (!_.isObject(obj)) <span class="hljs-keyword">return</span> [];
     <span class="hljs-keyword">if</span> (nativeKeys) <span class="hljs-keyword">return</span> nativeKeys(obj);
     <span class="hljs-keyword">var</span> keys = [];
-    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> obj) <span class="hljs-keyword">if</span> (_.has(obj, key)) keys.push(key);</pre></div></div>
-            
-        </li>
-        
-        
-        <li id="section-93">
-            <div class="annotation">
-              
-              <div class="pilwrap ">
-                <a class="pilcrow" href="#section-93">&#182;</a>
-              </div>
-              <p>Ahem, IE &lt; 9.</p>
-
-            </div>
-            
-            <div class="content"><div class='highlight'><pre>    <span class="hljs-keyword">if</span> (hasEnumBug) collectNonEnumProps(obj, keys);
+    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> obj) <span class="hljs-keyword">if</span> (_.has(obj, key)) keys.push(key);
     <span class="hljs-keyword">return</span> keys;
   };</pre></div></div>
             
         </li>
         
         
-        <li id="section-94">
+        <li id="section-92">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-94">&#182;</a>
+                <a class="pilcrow" href="#section-92">&#182;</a>
               </div>
               <p>Retrieve all the property names of an object.</p>
 
@@ -2068,33 +2025,18 @@ <h2 id="object-functions">Object Functions</h2>
             <div class="content"><div class='highlight'><pre>  _.allKeys = <span class="hljs-function"><span class="hljs-keyword">function</span><span class="hljs-params">(obj)</span> </span>{
     <span class="hljs-keyword">if</span> (!_.isObject(obj)) <span class="hljs-keyword">return</span> [];
     <span class="hljs-keyword">var</span> keys = [];
-    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> obj) keys.push(key);</pre></div></div>
-            
-        </li>
-        
-        
-        <li id="section-95">
-            <div class="annotation">
-              
-              <div class="pilwrap ">
-                <a class="pilcrow" href="#section-95">&#182;</a>
-              </div>
-              <p>Ahem, IE &lt; 9.</p>
-
-            </div>
-            
-            <div class="content"><div class='highlight'><pre>    <span class="hljs-keyword">if</span> (hasEnumBug) collectNonEnumProps(obj, keys);
+    <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> key <span class="hljs-keyword">in</span> obj) keys.push(key);
     <span class="hljs-keyword">return</span> keys;
   };</pre></div></div>
             
         </li>
         
         
-        <li id="section-96">
+        <li id="section-93">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-96">&#182;</a>
+                <a class="pilcrow" href="#section-93">&#182;</a>
               </div>
               <p>Retrieve the values of an object’s properties.</p>
 
@@ -2113,11 +2055,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-97">
+        <li id="section-94">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-97">&#182;</a>
+                <a class="pilcrow" href="#section-94">&#182;</a>
               </div>
               <p>Returns the results of applying the iteratee to each element of the object
 In contrast to _.map it returns an object</p>
@@ -2140,11 +2082,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-98">
+        <li id="section-95">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-98">&#182;</a>
+                <a class="pilcrow" href="#section-95">&#182;</a>
               </div>
               <p>Convert an object into a list of <code>[key, value]</code> pairs.</p>
 
@@ -2163,11 +2105,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-99">
+        <li id="section-96">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-99">&#182;</a>
+                <a class="pilcrow" href="#section-96">&#182;</a>
               </div>
               <p>Invert the keys and values of an object. The values must be serializable.</p>
 
@@ -2185,11 +2127,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-100">
+        <li id="section-97">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-100">&#182;</a>
+                <a class="pilcrow" href="#section-97">&#182;</a>
               </div>
               <p>Return a sorted list of the function names available on the object.
 Aliased as <code>methods</code></p>
@@ -2207,11 +2149,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-101">
+        <li id="section-98">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-101">&#182;</a>
+                <a class="pilcrow" href="#section-98">&#182;</a>
               </div>
               <p>Extend a given object with all the properties in passed-in object(s).</p>
 
@@ -2222,11 +2164,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-102">
+        <li id="section-99">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-102">&#182;</a>
+                <a class="pilcrow" href="#section-99">&#182;</a>
               </div>
               <p>Assigns a given object with all the own properties in the passed-in object(s)
 (<a href="https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign">https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object/assign</a>)</p>
@@ -2238,11 +2180,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-103">
+        <li id="section-100">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-103">&#182;</a>
+                <a class="pilcrow" href="#section-100">&#182;</a>
               </div>
               <p>Returns the first key on an object that passes a predicate test</p>
 
@@ -2260,11 +2202,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-104">
+        <li id="section-101">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-104">&#182;</a>
+                <a class="pilcrow" href="#section-101">&#182;</a>
               </div>
               <p>Return a copy of the object only containing the whitelisted properties.</p>
 
@@ -2275,7 +2217,9 @@ <h2 id="object-functions">Object Functions</h2>
     <span class="hljs-keyword">if</span> (obj == <span class="hljs-literal">null</span>) <span class="hljs-keyword">return</span> result;
     <span class="hljs-keyword">if</span> (_.isFunction(iteratee)) {
       iteratee = optimizeCb(iteratee, context);
-      <span class="hljs-keyword">for</span> (key <span class="hljs-keyword">in</span> obj) {
+      <span class="hljs-keyword">var</span> keys = _.allKeys(obj);
+      <span class="hljs-keyword">for</span> (<span class="hljs-keyword">var</span> i = <span class="hljs-number">0</span>; i &lt; keys.length; i++) {
+        <span class="hljs-keyword">var</span> key = keys[i];
         <span class="hljs-keyword">var</span> value = obj[key];
         <span class="hljs-keyword">if</span> (iteratee(value, key, obj)) result[key] = value;
       }
@@ -2293,11 +2237,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-105">
+        <li id="section-102">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-105">&#182;</a>
+                <a class="pilcrow" href="#section-102">&#182;</a>
               </div>
               <p>Return a copy of the object without the blacklisted properties.</p>
 
@@ -2318,11 +2262,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-106">
+        <li id="section-103">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-106">&#182;</a>
+                <a class="pilcrow" href="#section-103">&#182;</a>
               </div>
               <p>Fill in a given object with default properties.</p>
 
@@ -2333,11 +2277,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-107">
+        <li id="section-104">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-107">&#182;</a>
+                <a class="pilcrow" href="#section-104">&#182;</a>
               </div>
               <p>Create a (shallow-cloned) duplicate of an object.</p>
 
@@ -2351,11 +2295,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-108">
+        <li id="section-105">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-108">&#182;</a>
+                <a class="pilcrow" href="#section-105">&#182;</a>
               </div>
               <p>Invokes interceptor with the obj, and then returns obj.
 The primary purpose of this method is to “tap into” a method chain, in
@@ -2371,11 +2315,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-109">
+        <li id="section-106">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-109">&#182;</a>
+                <a class="pilcrow" href="#section-106">&#182;</a>
               </div>
               <p>Returns whether an object has a given set of <code>key:value</code> pairs.</p>
 
@@ -2395,11 +2339,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-110">
+        <li id="section-107">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-110">&#182;</a>
+                <a class="pilcrow" href="#section-107">&#182;</a>
               </div>
               <p>Internal recursive comparison function for <code>isEqual</code>.</p>
 
@@ -2410,11 +2354,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-111">
+        <li id="section-108">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-111">&#182;</a>
+                <a class="pilcrow" href="#section-108">&#182;</a>
               </div>
               <p>Identical objects are equal. <code>0 === -0</code>, but they aren’t identical.
 See the <a href="http://wiki.ecmascript.org/doku.php?id=harmony:egal">Harmony <code>egal</code> proposal</a>.</p>
@@ -2426,11 +2370,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-112">
+        <li id="section-109">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-112">&#182;</a>
+                <a class="pilcrow" href="#section-109">&#182;</a>
               </div>
               <p>A strict comparison is necessary because <code>null == undefined</code>.</p>
 
@@ -2441,11 +2385,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-113">
+        <li id="section-110">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-113">&#182;</a>
+                <a class="pilcrow" href="#section-110">&#182;</a>
               </div>
               <p>Unwrap any wrapped objects.</p>
 
@@ -2457,11 +2401,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-114">
+        <li id="section-111">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-114">&#182;</a>
+                <a class="pilcrow" href="#section-111">&#182;</a>
               </div>
               <p>Compare <code>[[Class]]</code> names.</p>
 
@@ -2474,11 +2418,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-115">
+        <li id="section-112">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-115">&#182;</a>
+                <a class="pilcrow" href="#section-112">&#182;</a>
               </div>
               <p>Strings, numbers, regular expressions, dates, and booleans are compared by value.</p>
 
@@ -2489,11 +2433,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-116">
+        <li id="section-113">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-116">&#182;</a>
+                <a class="pilcrow" href="#section-113">&#182;</a>
               </div>
               <p>RegExps are coerced to strings for comparison (Note: ‘’ + /a/i === ‘/a/i’)</p>
 
@@ -2504,11 +2448,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-117">
+        <li id="section-114">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-117">&#182;</a>
+                <a class="pilcrow" href="#section-114">&#182;</a>
               </div>
               <p>Primitives and their corresponding object wrappers are equivalent; thus, <code>&quot;5&quot;</code> is
 equivalent to <code>new String(&quot;5&quot;)</code>.</p>
@@ -2521,11 +2465,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-118">
+        <li id="section-115">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-118">&#182;</a>
+                <a class="pilcrow" href="#section-115">&#182;</a>
               </div>
               <p><code>NaN</code>s are equivalent, but non-reflexive.
 Object(NaN) is equivalent to NaN</p>
@@ -2537,11 +2481,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-119">
+        <li id="section-116">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-119">&#182;</a>
+                <a class="pilcrow" href="#section-116">&#182;</a>
               </div>
               <p>An <code>egal</code> comparison is performed for other numeric values.</p>
 
@@ -2554,11 +2498,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-120">
+        <li id="section-117">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-120">&#182;</a>
+                <a class="pilcrow" href="#section-117">&#182;</a>
               </div>
               <p>Coerce dates and booleans to numeric primitive values. Dates are compared by their
 millisecond representations. Note that invalid dates with millisecond representations
@@ -2576,11 +2520,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
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               <p>Objects with different constructors are not equivalent, but <code>Object</code>s or <code>Array</code>s
 from different frames are.</p>
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               <p>Assume equality for cyclic structures. The algorithm for detecting cyclic
 structures is adapted from ES 5.1 section 15.12.3, abstract operation <code>JO</code>.</p>
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               <p>Initializing stack of traversed objects.
 It’s done here since we only need them for objects and arrays comparison.</p>
@@ -2631,11 +2575,11 @@ <h2 id="object-functions">Object Functions</h2>
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               <p>Linear search. Performance is inversely proportional to the number of
 unique nested structures.</p>
@@ -2648,11 +2592,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-125">
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               <p>Add the first object to the stack of traversed objects.</p>
 
@@ -2664,11 +2608,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-126">
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               <p>Recursively compare objects and arrays.</p>
 
@@ -2679,11 +2623,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
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               <p>Compare array lengths to determine if a deep comparison is necessary.</p>
 
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         </li>
         
         
-        <li id="section-128">
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               <p>Deep compare the contents, ignoring non-numeric properties.</p>
 
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         </li>
         
         
-        <li id="section-129">
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-                <a class="pilcrow" href="#section-129">&#182;</a>
+                <a class="pilcrow" href="#section-126">&#182;</a>
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               <p>Deep compare objects.</p>
 
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         </li>
         
         
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               <p>Ensure that both objects contain the same number of properties before comparing deep equality.</p>
 
@@ -2745,11 +2689,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-131">
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               <p>Deep compare each member</p>
 
@@ -2763,11 +2707,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-132">
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+                <a class="pilcrow" href="#section-129">&#182;</a>
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               <p>Remove the first object from the stack of traversed objects.</p>
 
@@ -2781,11 +2725,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-133">
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+                <a class="pilcrow" href="#section-130">&#182;</a>
               </div>
               <p>Perform a deep comparison to check if two objects are equal.</p>
 
@@ -2798,11 +2742,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-134">
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               <p>Is a given array, string, or object empty?
 An “empty” object has no enumerable own-properties.</p>
@@ -2818,11 +2762,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-135">
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+                <a class="pilcrow" href="#section-132">&#182;</a>
               </div>
               <p>Is a given value a DOM element?</p>
 
@@ -2835,11 +2779,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-136">
+        <li id="section-133">
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+                <a class="pilcrow" href="#section-133">&#182;</a>
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               <p>Is a given value an array?
 Delegates to ECMA5’s native Array.isArray</p>
@@ -2853,11 +2797,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-137">
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+                <a class="pilcrow" href="#section-134">&#182;</a>
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               <p>Is a given variable an object?</p>
 
@@ -2871,11 +2815,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-138">
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+                <a class="pilcrow" href="#section-135">&#182;</a>
               </div>
               <p>Add some isType methods: isArguments, isFunction, isString, isNumber, isDate, isRegExp, isError.</p>
 
@@ -2890,11 +2834,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-139">
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+                <a class="pilcrow" href="#section-136">&#182;</a>
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               <p>Define a fallback version of the method in browsers (ahem, IE &lt; 9), where
 there isn’t any inspectable “Arguments” type.</p>
@@ -2910,11 +2854,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-140">
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+                <a class="pilcrow" href="#section-137">&#182;</a>
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               <p>Optimize <code>isFunction</code> if appropriate. Work around some typeof bugs in old v8,
 IE 11 (#1621), and in Safari 8 (#1929).</p>
@@ -2930,11 +2874,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-141">
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+                <a class="pilcrow" href="#section-138">&#182;</a>
               </div>
               <p>Is a given object a finite number?</p>
 
@@ -2947,11 +2891,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-142">
+        <li id="section-139">
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+                <a class="pilcrow" href="#section-139">&#182;</a>
               </div>
               <p>Is the given value <code>NaN</code>? (NaN is the only number which does not equal itself).</p>
 
@@ -2964,11 +2908,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-143">
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+                <a class="pilcrow" href="#section-140">&#182;</a>
               </div>
               <p>Is a given value a boolean?</p>
 
@@ -2981,11 +2925,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-144">
+        <li id="section-141">
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+                <a class="pilcrow" href="#section-141">&#182;</a>
               </div>
               <p>Is a given value equal to null?</p>
 
@@ -2998,11 +2942,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-145">
+        <li id="section-142">
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+                <a class="pilcrow" href="#section-142">&#182;</a>
               </div>
               <p>Is a given variable undefined?</p>
 
@@ -3015,11 +2959,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-146">
+        <li id="section-143">
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+                <a class="pilcrow" href="#section-143">&#182;</a>
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               <p>Shortcut function for checking if an object has a given property directly
 on itself (in other words, not on a prototype).</p>
@@ -3033,11 +2977,11 @@ <h2 id="object-functions">Object Functions</h2>
         </li>
         
         
-        <li id="section-147">
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               </div>
               <h2 id="utility-functions">Utility Functions</h2>
 
@@ -3046,11 +2990,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
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             </div>
@@ -3058,11 +3002,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-149">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-149">&#182;</a>
+                <a class="pilcrow" href="#section-146">&#182;</a>
               </div>
               <p>Run Underscore.js in <em>noConflict</em> mode, returning the <code>_</code> variable to its
 previous owner. Returns a reference to the Underscore object.</p>
@@ -3077,11 +3021,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-150">
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+                <a class="pilcrow" href="#section-147">&#182;</a>
               </div>
               <p>Keep the identity function around for default iteratees.</p>
 
@@ -3094,11 +3038,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-151">
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-                <a class="pilcrow" href="#section-151">&#182;</a>
+                <a class="pilcrow" href="#section-148">&#182;</a>
               </div>
               <p>Predicate-generating functions. Often useful outside of Underscore.</p>
 
@@ -3121,11 +3065,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-152">
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+                <a class="pilcrow" href="#section-149">&#182;</a>
               </div>
               <p>Generates a function for a given object that returns a given property.</p>
 
@@ -3140,11 +3084,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-153">
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+                <a class="pilcrow" href="#section-150">&#182;</a>
               </div>
               <p>Returns a predicate for checking whether an object has a given set of 
 <code>key:value</code> pairs.</p>
@@ -3161,11 +3105,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
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+                <a class="pilcrow" href="#section-151">&#182;</a>
               </div>
               <p>Run a function <strong>n</strong> times.</p>
 
@@ -3181,11 +3125,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-155">
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+                <a class="pilcrow" href="#section-152">&#182;</a>
               </div>
               <p>Return a random integer between min and max (inclusive).</p>
 
@@ -3202,11 +3146,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-156">
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               </div>
               <p>A (possibly faster) way to get the current timestamp as an integer.</p>
 
@@ -3219,11 +3163,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-157">
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+                <a class="pilcrow" href="#section-154">&#182;</a>
               </div>
               <p>List of HTML entities for escaping.</p>
 
@@ -3242,11 +3186,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-158">
+        <li id="section-155">
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-                <a class="pilcrow" href="#section-158">&#182;</a>
+                <a class="pilcrow" href="#section-155">&#182;</a>
               </div>
               <p>Functions for escaping and unescaping strings to/from HTML interpolation.</p>
 
@@ -3260,11 +3204,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-159">
+        <li id="section-156">
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-                <a class="pilcrow" href="#section-159">&#182;</a>
+                <a class="pilcrow" href="#section-156">&#182;</a>
               </div>
               <p>Regexes for identifying a key that needs to be escaped</p>
 
@@ -3284,11 +3228,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-160">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-160">&#182;</a>
+                <a class="pilcrow" href="#section-157">&#182;</a>
               </div>
               <p>If the value of the named <code>property</code> is a function then invoke it with the
 <code>object</code> as context; otherwise, return it.</p>
@@ -3306,11 +3250,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-161">
+        <li id="section-158">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-161">&#182;</a>
+                <a class="pilcrow" href="#section-158">&#182;</a>
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               <p>Generate a unique integer id (unique within the entire client session).
 Useful for temporary DOM ids.</p>
@@ -3326,11 +3270,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-162">
+        <li id="section-159">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-162">&#182;</a>
+                <a class="pilcrow" href="#section-159">&#182;</a>
               </div>
               <p>By default, Underscore uses ERB-style template delimiters, change the
 following template settings to use alternative delimiters.</p>
@@ -3346,11 +3290,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-163">
+        <li id="section-160">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-163">&#182;</a>
+                <a class="pilcrow" href="#section-160">&#182;</a>
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               <p>When customizing <code>templateSettings</code>, if you don’t want to define an
 interpolation, evaluation or escaping regex, we need one that is
@@ -3363,11 +3307,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-164">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-164">&#182;</a>
+                <a class="pilcrow" href="#section-161">&#182;</a>
               </div>
               <p>Certain characters need to be escaped so that they can be put into a
 string literal.</p>
@@ -3392,11 +3336,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-165">
+        <li id="section-162">
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               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-165">&#182;</a>
+                <a class="pilcrow" href="#section-162">&#182;</a>
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               <p>JavaScript micro-templating, similar to John Resig’s implementation.
 Underscore templating handles arbitrary delimiters, preserves whitespace,
@@ -3412,11 +3356,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-166">
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-                <a class="pilcrow" href="#section-166">&#182;</a>
+                <a class="pilcrow" href="#section-163">&#182;</a>
               </div>
               <p>Combine delimiters into one regular expression via alternation.</p>
 
@@ -3431,11 +3375,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-167">
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-                <a class="pilcrow" href="#section-167">&#182;</a>
+                <a class="pilcrow" href="#section-164">&#182;</a>
               </div>
               <p>Compile the template source, escaping string literals appropriately.</p>
 
@@ -3458,11 +3402,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-168">
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+                <a class="pilcrow" href="#section-165">&#182;</a>
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               <p>Adobe VMs need the match returned to produce the correct offest.</p>
 
@@ -3475,11 +3419,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-169">
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+                <a class="pilcrow" href="#section-166">&#182;</a>
               </div>
               <p>If a variable is not specified, place data values in local scope.</p>
 
@@ -3505,11 +3449,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-170">
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+                <a class="pilcrow" href="#section-167">&#182;</a>
               </div>
               <p>Provide the compiled source as a convenience for precompilation.</p>
 
@@ -3524,11 +3468,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-171">
+        <li id="section-168">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-171">&#182;</a>
+                <a class="pilcrow" href="#section-168">&#182;</a>
               </div>
               <p>Add a “chain” function. Start chaining a wrapped Underscore object.</p>
 
@@ -3543,11 +3487,11 @@ <h2 id="utility-functions">Utility Functions</h2>
         </li>
         
         
-        <li id="section-172">
+        <li id="section-169">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-172">&#182;</a>
+                <a class="pilcrow" href="#section-169">&#182;</a>
               </div>
               <h2 id="oop">OOP</h2>
 
@@ -3556,11 +3500,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-173">
+        <li id="section-170">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-173">&#182;</a>
+                <a class="pilcrow" href="#section-170">&#182;</a>
               </div>
               <p>If Underscore is called as a function, it returns a wrapped object that
 can be used OO-style. This wrapper holds altered versions of all the
@@ -3571,11 +3515,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-174">
+        <li id="section-171">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-174">&#182;</a>
+                <a class="pilcrow" href="#section-171">&#182;</a>
               </div>
               <p>Helper function to continue chaining intermediate results.</p>
 
@@ -3588,11 +3532,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-175">
+        <li id="section-172">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-175">&#182;</a>
+                <a class="pilcrow" href="#section-172">&#182;</a>
               </div>
               <p>Add your own custom functions to the Underscore object.</p>
 
@@ -3612,11 +3556,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-176">
+        <li id="section-173">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-176">&#182;</a>
+                <a class="pilcrow" href="#section-173">&#182;</a>
               </div>
               <p>Add all of the Underscore functions to the wrapper object.</p>
 
@@ -3627,11 +3571,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-177">
+        <li id="section-174">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-177">&#182;</a>
+                <a class="pilcrow" href="#section-174">&#182;</a>
               </div>
               <p>Add all mutator Array functions to the wrapper.</p>
 
@@ -3650,11 +3594,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-178">
+        <li id="section-175">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-178">&#182;</a>
+                <a class="pilcrow" href="#section-175">&#182;</a>
               </div>
               <p>Add all accessor Array functions to the wrapper.</p>
 
@@ -3670,11 +3614,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-179">
+        <li id="section-176">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-179">&#182;</a>
+                <a class="pilcrow" href="#section-176">&#182;</a>
               </div>
               <p>Extracts the result from a wrapped and chained object.</p>
 
@@ -3687,11 +3631,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-180">
+        <li id="section-177">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-180">&#182;</a>
+                <a class="pilcrow" href="#section-177">&#182;</a>
               </div>
               <p>Provide unwrapping proxy for some methods used in engine operations
 such as arithmetic and JSON stringification.</p>
@@ -3707,11 +3651,11 @@ <h2 id="oop">OOP</h2>
         </li>
         
         
-        <li id="section-181">
+        <li id="section-178">
             <div class="annotation">
               
               <div class="pilwrap ">
-                <a class="pilcrow" href="#section-181">&#182;</a>
+                <a class="pilcrow" href="#section-178">&#182;</a>
               </div>
               <p>AMD registration happens at the end for compatibility with AMD loaders
 that may not enforce next-turn semantics on modules. Even though general
diff --git a/index.html b/index.html
index 26325fc9d..fc005639d 100644
--- a/index.html
+++ b/index.html
@@ -180,7 +180,7 @@
   <div id="sidebar" class="interface">
 
     <a class="toc_title" href="#">
-      Underscore.js <span class="version">(1.8.0)</span>
+      Underscore.js <span class="version">(1.8.1)</span>
     </a>
     <ul class="toc_section">
       <li>&raquo; <a href="https://github.com/jashkenas/underscore">GitHub Repository</a></li>
@@ -290,10 +290,11 @@
       <li>- <a href="#clone">clone</a></li>
       <li>- <a href="#tap">tap</a></li>
       <li>- <a href="#has">has</a></li>
-      <li>- <a href="#matches">matches</a></li>
+      <li>- <a href="#matcher">matcher</a></li>
       <li>- <a href="#property">property</a></li>
       <li>- <a href="#propertyOf">propertyOf</a></li>
       <li>- <a href="#isEqual">isEqual</a></li>
+      <li>- <a href="#isMatch">isMatch</a></li>
       <li>- <a href="#isEmpty">isEmpty</a></li>
       <li>- <a href="#isElement">isElement</a></li>
       <li>- <a href="#isArray">isArray</a></li>
@@ -402,13 +403,13 @@ <h2>Downloads <i style="padding-left: 12px; font-size:12px;">(Right-click, and u
 
     <table style="min-width: 640px;">
       <tr>
-        <td><a href="underscore.js">Development Version (1.8.0)</a></td>
-        <td><i>51kb, Uncompressed with Plentiful Comments</i></td>
+        <td><a href="underscore.js">Development Version (1.8.1)</a></td>
+        <td><i>49kb, Uncompressed with Plentiful Comments</i></td>
       </tr>
       <tr>
-        <td><a href="underscore-min.js">Production Version (1.8.0)</a></td>
+        <td><a href="underscore-min.js">Production Version (1.8.1)</a></td>
         <td>
-          <i>5.7kb, Minified and Gzipped <b>(3x smaller than Lodash ;)</b></i>
+          <i>5.4kb, Minified and Gzipped <b>(3x smaller than Lodash ;)</b></i>
           &nbsp;<small>(<a href="underscore-min.map">Source Map</a>)</small>
         </td>
       </tr>
@@ -1549,14 +1550,14 @@ <h2 id="objects">Object Functions</h2>
 _.propertyOf(stooge)('name');
 =&gt; 'moe'</pre>
 
-      <p id="matches">
-        <b class="header">matches</b><code>_.matches(attrs)</code>
+      <p id="matcher">
+        <b class="header">matcher</b><code>_.matcher(attrs)</code>
         <br />
         Returns a predicate function that will tell you if a passed in object
         contains all of the key/value properties present in <b>attrs</b>.
       </p>
       <pre>
-var ready = _.matches({selected: true, visible: true});
+var ready = _.matcher({selected: true, visible: true});
 var readyToGoList = _.filter(list, ready);</pre>
 
       <p id="isEqual">
@@ -1572,6 +1573,18 @@ <h2 id="objects">Object Functions</h2>
 =&gt; false
 _.isEqual(stooge, clone);
 =&gt; true
+</pre>
+
+      <p id="isMatch">
+        <b class="header">isMatch</b><code>_.isMatch(object, properties)</code>
+        <br />
+        Tells you if the keys and values in <b>properties</b> are contained
+        in <b>object</b>.
+      </p>
+      <pre>
+var stooge = {name: 'moe', age: 32};
+_.isMatch(stooge, {age: 32});
+=&gt; true
 </pre>
 
       <p id="isEmpty">
@@ -2178,6 +2191,17 @@ <h2 id="links">Links &amp; Suggested Reading</h2>
 
       <h2 id="changelog">Change Log</h2>
 
+      <p id="1.8.1">
+        <b class="header">1.8.1</b> &mdash; <small><i>Feb. 19, 2015</i></small> &mdash; <a href="https://github.com/jashkenas/underscore/compare/1.8.0...1.8.1">Diff</a> &mdash; <a href="https://cdn.rawgit.com/jashkenas/underscore/1.8.1/index.html">Docs</a><br />
+        <ul>
+          <li>
+            Fixes/changes some old-Internet-Explorer and related edge case 
+            behavior. Test your app with Underscore 1.8.1 in an old IE and let
+            us know how its doing...
+          </li>
+        </ul>
+      </p>
+
       <p id="1.8.0">
         <b class="header">1.8.0</b> &mdash; <small><i>Feb. 19, 2015</i></small> &mdash; <a href="https://github.com/jashkenas/underscore/compare/1.7.0...1.8.0">Diff</a> &mdash; <a href="https://cdn.rawgit.com/jashkenas/underscore/1.8.0/index.html">Docs</a><br />
         <ul>
@@ -2202,6 +2226,11 @@ <h2 id="changelog">Change Log</h2>
             Added <tt>_.findIndex</tt> and <tt>_.findLastIndex</tt> functions,
             which nicely complement their twin-twins <tt>_.indexOf</tt> and <tt>_.lastIndexOf</tt>.
           </li>
+          <li>
+            Added an <tt>_.isMatch</tt> predicate function that tells you if an
+            object matches key-value properties. A kissing cousin of 
+            <tt>_.isEqual</tt> and <tt>_.matcher</tt>.
+          </li>
           <li>
             Added an <tt>_.isError</tt> function.
           </li>
@@ -2217,6 +2246,10 @@ <h2 id="changelog">Change Log</h2>
             Added the <tt>_.propertyOf</tt> function generator as a mirror-world 
             version of <tt>_.property</tt>.
           </li>
+          <li>
+            Deprecated <tt>_.matches</tt>. It's now known by a more harmonious
+            name — <tt>_.matcher</tt>.
+          </li>
           <li>
             Various and diverse code simplifications, changes for improved 
             cross-platform compatibility, and edge case bug fixes.
diff --git a/package.json b/package.json
index 116d5ac8b..d97baed4d 100644
--- a/package.json
+++ b/package.json
@@ -15,7 +15,7 @@
     "url": "git://github.com/jashkenas/underscore.git"
   },
   "main": "underscore.js",
-  "version": "1.8.0",
+  "version": "1.8.1",
   "devDependencies": {
     "docco": "0.6.x",
     "eslint": "0.6.x",
diff --git a/test/objects.js b/test/objects.js
index a64536ecf..964c03e6d 100644
--- a/test/objects.js
+++ b/test/objects.js
@@ -15,24 +15,6 @@
     deepEqual(_.keys(1), []);
     deepEqual(_.keys('a'), []);
     deepEqual(_.keys(true), []);
-
-    // keys that may be missed if the implementation isn't careful
-    var trouble = {
-      'constructor': Object,
-      'valueOf': _.noop,
-      'hasOwnProperty': null,
-      'toString': 5,
-      'toLocaleString': undefined,
-      'propertyIsEnumerable': /a/,
-      'isPrototypeOf': this,
-      '__defineGetter__': Boolean,
-      '__defineSetter__': {},
-      '__lookupSetter__': false,
-      '__lookupGetter__': []
-    };
-    var troubleKeys = ['constructor', 'valueOf', 'hasOwnProperty', 'toString', 'toLocaleString', 'propertyIsEnumerable',
-                  'isPrototypeOf', '__defineGetter__', '__defineSetter__', '__lookupSetter__', '__lookupGetter__'].sort();
-    deepEqual(_.keys(trouble).sort(), troubleKeys, 'matches non-enumerable properties');
   });
 
   test('allKeys', function() {
@@ -48,25 +30,11 @@
       deepEqual(_.allKeys(val), []);
     });
 
-    // allKeys that may be missed if the implementation isn't careful
-    var trouble = {
-      constructor: Object,
-      valueOf: _.noop,
-      hasOwnProperty: null,
-      toString: 5,
-      toLocaleString: undefined,
-      propertyIsEnumerable: /a/,
-      isPrototypeOf: this
-    };
-    var troubleKeys = ['constructor', 'valueOf', 'hasOwnProperty', 'toString', 'toLocaleString', 'propertyIsEnumerable',
-                  'isPrototypeOf'].sort();
-    deepEqual(_.allKeys(trouble).sort(), troubleKeys, 'matches non-enumerable properties');
-
     function A() {}
     A.prototype.foo = 'foo';
     var b = new A();
     b.bar = 'bar';
-    deepEqual(_.allKeys(b), ['bar', 'foo'], 'should include inherited keys');
+    deepEqual(_.allKeys(b).sort(), ['bar', 'foo'], 'should include inherited keys');
 
     function y() {}
     y.x = 'z';
@@ -543,10 +511,6 @@
     var args = function(){ return arguments; };
     ok(_.isEmpty(args()), 'empty arguments object is empty');
     ok(!_.isEmpty(args('')), 'non-empty arguments object is not empty');
-
-    // covers collecting non-enumerable properties in IE < 9
-    var nonEnumProp = {'toString': 5};
-    ok(!_.isEmpty(nonEnumProp), 'non-enumerable property is not empty');
   });
 
   if (typeof document === 'object') {
@@ -772,10 +736,6 @@
 
     Prototest.x = 5;
     ok(_.isMatch({x: 5, y: 1}, Prototest), 'spec can be a function');
-
-    //null edge cases
-    var oCon = {'constructor': Object};
-    deepEqual(_.map([null, undefined, 5, {}], _.partial(_.isMatch, _, oCon)), [false, false, false, true], 'doesnt fasley match constructor on undefined/null');
   });
 
   test('matcher', function() {
@@ -828,11 +788,6 @@
     o.b = 2;
     o.a = 1;
     equal(m({'b': 1}), true, 'changing spec object doesnt change matches result');
-
-
-    //null edge cases
-    var oCon = _.matcher({'constructor': Object});
-    deepEqual(_.map([null, undefined, 5, {}], oCon), [false, false, false, true], 'doesnt fasley match constructor on undefined/null');
   });
 
   test('matcher', function() {
@@ -885,11 +840,6 @@
     o.b = 2;
     o.a = 1;
     equal(m({'b': 1}), true, 'changing spec object doesnt change matches result');
-
-
-    //null edge cases
-    var oCon = _.matcher({'constructor': Object});
-    deepEqual(_.map([null, undefined, 5, {}], oCon), [false, false, false, true], 'doesnt fasley match constructor on undefined/null');
   });
 
   test('findKey', function() {
diff --git a/underscore-min.js b/underscore-min.js
index b947165eb..1f17745d1 100644
--- a/underscore-min.js
+++ b/underscore-min.js
@@ -1,6 +1,6 @@
-//     Underscore.js 1.8.0
+//     Underscore.js 1.8.1
 //     http://underscorejs.org
 //     (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 //     Underscore may be freely distributed under the MIT license.
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\ No newline at end of file
diff --git a/underscore.js b/underscore.js
index 7e9cddc93..9bd0c8fd4 100644
--- a/underscore.js
+++ b/underscore.js
@@ -1,4 +1,4 @@
-//     Underscore.js 1.8.0
+//     Underscore.js 1.8.1
 //     http://underscorejs.org
 //     (c) 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
 //     Underscore may be freely distributed under the MIT license.
@@ -32,7 +32,7 @@
     nativeBind         = FuncProto.bind,
     nativeCreate       = Object.create;
 
-  // Reusable constructor function for prototype setting.
+  // Naked function reference for surrogate-prototype-swapping.
   var Ctor = function(){};
 
   // Create a safe reference to the Underscore object for use below.
@@ -55,7 +55,7 @@
   }
 
   // Current version.
-  _.VERSION = '1.8.0';
+  _.VERSION = '1.8.1';
 
   // Internal function that returns an efficient (for current engines) version
   // of the passed-in callback, to be repeatedly applied in other Underscore
@@ -705,9 +705,10 @@
     if (nativeBind && func.bind === nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
     if (!_.isFunction(func)) throw new TypeError('Bind must be called on a function');
     var args = slice.call(arguments, 2);
-    return function bound() {
+    var bound = function() {
       return executeBound(func, bound, context, this, args.concat(slice.call(arguments)));
     };
+    return bound;
   };
 
   // Partially apply a function by creating a version that has had some of its
@@ -715,7 +716,7 @@
   // as a placeholder, allowing any combination of arguments to be pre-filled.
   _.partial = function(func) {
     var boundArgs = slice.call(arguments, 1);
-    return function bound() {
+    var bound = function() {
       var position = 0, length = boundArgs.length;
       var args = Array(length);
       for (var i = 0; i < length; i++) {
@@ -724,6 +725,7 @@
       while (position < arguments.length) args.push(arguments[position++]);
       return executeBound(func, bound, this, this, args);
     };
+    return bound;
   };
 
   // Bind a number of an object's methods to that object. Remaining arguments
@@ -892,24 +894,6 @@
   // Object Functions
   // ----------------
 
-  // Keys in IE < 9 that won't be iterated by `for key in ...` and thus missed.
-  var hasEnumBug = !{toString: null}.propertyIsEnumerable('toString');
-  var nonEnumerableProps = ['constructor', 'valueOf', 'isPrototypeOf', 'toString',
-                      'propertyIsEnumerable', 'hasOwnProperty', 'toLocaleString'];
-
-  function collectNonEnumProps(obj, keys) {
-    var nonEnumIdx = nonEnumerableProps.length;
-    var proto = typeof obj.constructor === 'function' ? FuncProto : ObjProto;
-
-    while (nonEnumIdx--) {
-      var prop = nonEnumerableProps[nonEnumIdx];
-      if (prop === 'constructor' ? _.has(obj, prop) : prop in obj &&
-        obj[prop] !== proto[prop] && !_.contains(keys, prop)) {
-        keys.push(prop);
-      }
-    }
-  }
-
   // Retrieve the names of an object's own properties.
   // Delegates to **ECMAScript 5**'s native `Object.keys`
   _.keys = function(obj) {
@@ -917,8 +901,6 @@
     if (nativeKeys) return nativeKeys(obj);
     var keys = [];
     for (var key in obj) if (_.has(obj, key)) keys.push(key);
-    // Ahem, IE < 9.
-    if (hasEnumBug) collectNonEnumProps(obj, keys);
     return keys;
   };
 
@@ -927,8 +909,6 @@
     if (!_.isObject(obj)) return [];
     var keys = [];
     for (var key in obj) keys.push(key);
-    // Ahem, IE < 9.
-    if (hasEnumBug) collectNonEnumProps(obj, keys);
     return keys;
   };
 
@@ -1012,7 +992,9 @@
     if (obj == null) return result;
     if (_.isFunction(iteratee)) {
       iteratee = optimizeCb(iteratee, context);
-      for (key in obj) {
+      var keys = _.allKeys(obj);
+      for (var i = 0; i < keys.length; i++) {
+        var key = keys[i];
         var value = obj[key];
         if (iteratee(value, key, obj)) result[key] = value;
       }