diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index b2b90bf1e..a776b8fb1 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -12,13 +12,7 @@
   /** Used as a safe reference for `undefined` in pre ES5 environments */
   var undefined;
 
-  /** Used to generate unique IDs */
-  var idCounter = 0;
-
-  /** Used by methods to exit iteration */
-  var breakIndicator = '__lodash_break_1335248838000__';
-
-  /** Used to compose bitmasks for `__bindData__` */
+  /** Used to compose bitmasks for wrapper metadata */
   var BIND_FLAG = 1,
       BIND_KEY_FLAG = 2,
       CURRY_FLAG = 4,
@@ -26,6 +20,18 @@
       PARTIAL_FLAG = 16,
       PARTIAL_RIGHT_FLAG = 32;
 
+  /** Used as the semantic version number */
+  var version = '2.4.1';
+
+  /** Used as the property name for wrapper metadata */
+  var expando = '__lodash@' + version + '__';
+
+  /** Used by methods to exit iteration */
+  var breakIndicator = expando + 'breaker__';
+
+  /** Used to generate unique IDs */
+  var idCounter = 0;
+
   /** Used to match HTML entities and HTML characters */
   var reEscapedHtml = /&(?:amp|lt|gt|quot|#x27);/g,
       reUnescapedHtml = /[&<>"']/g;
@@ -35,9 +41,15 @@
       reEvaluate = /<%([\s\S]+?)%>/g,
       reInterpolate = /<%=([\s\S]+?)%>/g;
 
+  /** Used to detected named functions */
+  var reFuncName = /^\s*function[ \n\r\t]+\w/;
+
   /** Used to ensure capturing order of template delimiters */
   var reNoMatch = /($^)/;
 
+  /** Used to detect functions containing a `this` reference */
+  var reThis = /\bthis\b/;
+
   /** Used to match unescaped characters in compiled string literals */
   var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g;
 
@@ -52,6 +64,14 @@
       regexpClass = '[object RegExp]',
       stringClass = '[object String]';
 
+  /** Used as the property descriptor for wrapper metadata */
+  var descriptor = {
+    'configurable': false,
+    'enumerable': false,
+    'value': null,
+    'writable': false
+  };
+
   /**
    * Used to convert characters to HTML entities:
    *
@@ -229,7 +249,19 @@
       hasOwnProperty = objectProto.hasOwnProperty,
       push = arrayRef.push,
       propertyIsEnumerable = objectProto.propertyIsEnumerable,
-      splice = arrayRef.splice;
+      splice = arrayRef.splice,
+      unshift = arrayRef.unshift;
+
+  /** Used to set meta data on functions */
+  var defineProperty = (function() {
+    // IE 8 only accepts DOM elements
+    try {
+      var o = {},
+          func = isNative(func = Object.defineProperty) && func,
+          result = func(o, o, o) && func;
+    } catch(e) { }
+    return result;
+  }());
 
   /* Native method shortcuts for methods with the same name as other `lodash` methods */
   var nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate,
@@ -410,13 +442,13 @@
    * sets its meta data.
    *
    * @private
-   * @param {Array} bindData The bind data array.
+   * @param {Array} data The metadata array.
    * @returns {Function} Returns the new bound function.
    */
-  function baseBind(bindData) {
-    var func = bindData[0],
-        partialArgs = bindData[2],
-        thisArg = bindData[4];
+  function baseBind(data) {
+    var func = data[0],
+        thisArg = data[3],
+        partialArgs = data[4];
 
     function bound() {
       // `Function#bind` spec
@@ -438,6 +470,7 @@
       }
       return func.apply(thisArg, args || arguments);
     }
+    setData(bound, data);
     return bound;
   }
 
@@ -485,6 +518,28 @@
     if (typeof thisArg == 'undefined' || !('prototype' in func)) {
       return func;
     }
+    var data = func[expando];
+    if (typeof data == 'undefined') {
+      if (support.funcNames) {
+        data = !func.name;
+      }
+      data = data || !support.funcDecomp;
+      if (!data) {
+        var source = fnToString.call(func);
+        if (!support.funcNames) {
+          data = !reFuncName.test(source);
+        }
+        if (!data) {
+          // checks if `func` references the `this` keyword and stores the result
+          data = reThis.test(source);
+          setData(func, data);
+        }
+      }
+    }
+    // exit early if there are no `this` references or `func` is bound
+    if (data === false || (data !== true && data[1] & BIND_FLAG)) {
+      return func;
+    }
     switch (argCount) {
       case 1: return function(value) {
         return func.call(thisArg, value);
@@ -507,16 +562,16 @@
    * sets its meta data.
    *
    * @private
-   * @param {Array} bindData The bind data array.
+   * @param {Array} data The metadata array.
    * @returns {Function} Returns the new function.
    */
-  function baseCreateWrapper(bindData) {
-    var func = bindData[0],
-        bitmask = bindData[1],
-        partialArgs = bindData[2],
-        partialRightArgs = bindData[3],
-        thisArg = bindData[4],
-        arity = bindData[5];
+  function baseCreateWrapper(data) {
+    var func = data[0],
+        bitmask = data[1],
+        arity = data[2],
+        thisArg = data[3],
+        partialArgs = data[4],
+        partialRightArgs = data[5];
 
     var isBind = bitmask & BIND_FLAG,
         isBindKey = bitmask & BIND_KEY_FLAG,
@@ -535,10 +590,15 @@
         if (partialRightArgs) {
           push.apply(args, partialRightArgs);
         }
-        if (isCurry && args.length < arity) {
+        var argsLength = arguments.length;
+        if (isCurry && argsLength < arity) {
           bitmask |= PARTIAL_FLAG;
-          bitmask &= ~PARTIAL_RIGHT_FLAG;
-          return baseCreateWrapper([func, (isCurryBound ? bitmask : bitmask & ~(BIND_FLAG | BIND_KEY_FLAG)), args, null, thisArg, arity]);
+          bitmask &= ~PARTIAL_RIGHT_FLAG
+          if (!isCurryBound) {
+            bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG);
+          }
+          var newArity = nativeMax(0, arity - argsLength);
+          return baseCreateWrapper([func, bitmask, newArity, thisArg, args]);
         }
       }
       args || (args = arguments);
@@ -552,6 +612,7 @@
       }
       return func.apply(thisBinding, args);
     }
+    setData(bound, data);
     return bound;
   }
 
@@ -879,25 +940,23 @@
    * @param {Function|string} func The function or method name to reference.
    * @param {number} bitmask The bitmask of flags to compose.
    *  The bitmask may be composed of the following flags:
-   *  1 - `_.bind`
-   *  2 - `_.bindKey`
-   *  4 - `_.curry`
-   *  8 - `_.curry` (bound)
+   *  1  - `_.bind`
+   *  2  - `_.bindKey`
+   *  4  - `_.curry`
+   *  8  - `_.curry` (bound)
    *  16 - `_.partial`
    *  32 - `_.partialRight`
+   * @param {number} [arity] The arity of `func`.
+   * @param {*} [thisArg] The `this` binding of `func`.
    * @param {Array} [partialArgs] An array of arguments to prepend to those
    *  provided to the new function.
    * @param {Array} [partialRightArgs] An array of arguments to append to those
    *  provided to the new function.
-   * @param {*} [thisArg] The `this` binding of `func`.
-   * @param {number} [arity] The arity of `func`.
    * @returns {Function} Returns the new function.
    */
-  function createWrapper(func, bitmask, partialArgs, partialRightArgs, thisArg, arity) {
+  function createWrapper(func, bitmask, arity, thisArg, partialArgs, partialRightArgs) {
     var isBind = bitmask & BIND_FLAG,
         isBindKey = bitmask & BIND_KEY_FLAG,
-        isCurry = bitmask & CURRY_FLAG,
-        isCurryBound = bitmask & CURRY_BOUND_FLAG,
         isPartial = bitmask & PARTIAL_FLAG,
         isPartialRight = bitmask & PARTIAL_RIGHT_FLAG;
 
@@ -905,16 +964,69 @@
       throw new TypeError;
     }
     if (isPartial && !partialArgs.length) {
-      bitmask &= ~16;
+      bitmask &= ~PARTIAL_FLAG;
       isPartial = partialArgs = false;
     }
     if (isPartialRight && !partialRightArgs.length) {
-      bitmask &= ~32;
+      bitmask &= ~PARTIAL_RIGHT_FLAG;
       isPartialRight = partialRightArgs = false;
     }
+    var data = !isBindKey && func[expando];
+    if (data && data !== true) {
+      // shallow clone `data`
+      data = slice(data);
+
+      // clone partial left arguments
+      if (data[4]) {
+        data[4] = slice(data[4]);
+      }
+      // clone partial right arguments
+      if (data[5]) {
+        data[5] = slice(data[5]);
+      }
+      // set arity if provided
+      if (typeof arity == 'number') {
+        data[2] = arity;
+      }
+      // set `thisArg` if not previously bound
+      var bound = data[1] & BIND_FLAG;
+      if (isBind && !bound) {
+        data[3] = thisArg;
+      }
+      // set if currying a bound function
+      if (!isBind && bound) {
+        bitmask |= CURRY_BOUND_FLAG;
+      }
+      // append partial left arguments
+      if (isPartial) {
+        if (data[4]) {
+          push.apply(data[4], partialArgs);
+        } else {
+          data[4] = partialArgs;
+        }
+      }
+      // prepend partial right arguments
+      if (isPartialRight) {
+        if (data[5]) {
+          unshift.apply(data[5], partialRightArgs);
+        } else {
+          data[5] = partialRightArgs;
+        }
+      }
+      // merge flags
+      data[1] |= bitmask;
+      return createWrapper.apply(null, data);
+    }
+    if (arity == null) {
+      arity = isBindKey ? 0 : func.length;
+    } else if (arity < 0) {
+      arity = 0;
+    }
     // fast path for `_.bind`
-    var creater = (bitmask == BIND_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) ? baseBind : baseCreateWrapper;
-    return creater([func, bitmask, partialArgs, partialRightArgs, thisArg, arity]);
+    data = [func, bitmask, arity, thisArg, partialArgs, partialRightArgs];
+    return (bitmask == BIND_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG))
+      ? baseBind(data)
+      : baseCreateWrapper(data);
   }
 
   /**
@@ -941,6 +1053,18 @@
     return typeof value == 'function' && reNative.test(fnToString.call(value));
   }
 
+  /**
+   * Sets wrapper metadata on a given function.
+   *
+   * @private
+   * @param {Function} func The function to set data on.
+   * @param {Array} value The data array to set.
+   */
+  var setData = !defineProperty ? noop : function(func, value) {
+    descriptor.value = value;
+    defineProperty(func, expando, descriptor);
+  };
+
   /*--------------------------------------------------------------------------*/
 
   /**
@@ -3156,9 +3280,14 @@
    * // => 'hi fred'
    */
   function bind(func, thisArg) {
-    return arguments.length > 2
-      ? createWrapper(func, BIND_FLAG | PARTIAL_FLAG, slice(arguments, 2), null, thisArg)
-      : createWrapper(func, BIND_FLAG, null, null, thisArg);
+    if (arguments.length < 3) {
+      return createWrapper(func, BIND_FLAG, null, thisArg);
+    }
+    var arity = func && (func[expando] ? func[expando][2] : func.length),
+        partialArgs = slice(arguments, 2);
+
+    arity -= partialArgs.length;
+    return createWrapper(func, BIND_FLAG | PARTIAL_FLAG, arity, thisArg, partialArgs);
   }
 
   /**
@@ -3194,7 +3323,7 @@
 
     while (++index < length) {
       var key = funcs[index];
-      object[key] = createWrapper(object[key], BIND_FLAG, null, null, object);
+      object[key] = createWrapper(object[key], BIND_FLAG, null, object);
     }
     return object;
   }
@@ -3542,7 +3671,11 @@
    * // => 'hi fred'
    */
   function partial(func) {
-    return createWrapper(func, PARTIAL_FLAG, slice(arguments, 1));
+    var arity = func && (func[expando] ? func[expando][2] : func.length),
+        partialArgs = slice(arguments, 1);
+
+    arity -= partialArgs.length;
+    return createWrapper(func, PARTIAL_FLAG, arity, null, partialArgs);
   }
 
   /**
@@ -3619,7 +3752,7 @@
    * // => '<p>fred, barney, &amp; pebbles</p>'
    */
   function wrap(value, wrapper) {
-    return createWrapper(wrapper, PARTIAL_FLAG, [value]);
+    return createWrapper(wrapper, PARTIAL_FLAG, null, null, [value]);
   }
 
   /*--------------------------------------------------------------------------*/
@@ -5071,7 +5204,7 @@
    * @memberOf _
    * @type string
    */
-  lodash.VERSION = '2.4.1';
+  lodash.VERSION = version;
 
   // add "Chaining" functions to the wrapper
   lodash.prototype.chain = wrapperChain;
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 6fa1588d2..2d01a6d64 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,38 +3,40 @@
  * Lo-Dash 2.4.1 (Custom Build) lodash.com/license | Underscore.js 1.5.2 underscorejs.org/LICENSE
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  */
-;(function(){function n(n){var r=[];if(!L(n))return r;for(var t in n)Pr.call(n,t)&&r.push(t);return r}function r(n,r){if(L(n))for(var t in n)if(r(n[t],t,n)===ir)break}function t(n,r,t){t=(t||0)-1;for(var e=n?n.length:0;++t<e;)if(n[t]===r)return t;return-1}function e(n,r){var t;n:{t=n.f;var e=r.f;if(t!==e){if(t>e||typeof t=="undefined"){t=1;break n}if(t<e||typeof e=="undefined"){t=-1;break n}}t=0}return t||n.g-r.g}function u(n){return Ar[n]}function o(n){return"\\"+Sr[n]}function i(n){return Er[n]}function f(n){return n instanceof f?n:new a(n)
-}function a(n,r){this.__chain__=!!r,this.__wrapped__=n}function c(n){function r(){if(e){var n=E(e);Ur.apply(n,arguments)}if(this instanceof r){var o=l(t.prototype),n=t.apply(o,n||arguments);return L(n)?n:o}return t.apply(u,n||arguments)}var t=n[0],e=n[2],u=n[4];return r}function l(n){return L(n)?Hr(n):{}}function p(n,r,t){if(typeof n!="function")return nr;if(typeof r=="undefined"||!("prototype"in n))return n;switch(t){case 1:return function(t){return n.call(r,t)};case 2:return function(t,e){return n.call(r,t,e)
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-return r}function g(n,r){for(var t=-1,e=d(),u=n?n.length:0,o=[];++t<u;){var i=n[t];0>e(r,i)&&o.push(i)}return o}function v(n,r){var t=-1,e=n?n.length:0;if(typeof e=="number")for(;++t<e&&r(n[t],t,n)!==ir;);else for(var t=-1,e=ft(n),u=e.length;++t<u;){var o=e[t];if(r(n[o],o,n)===ir)break}}function h(n,r,t,e){e=(e||0)-1;for(var u=n?n.length:0,o=[];++e<u;){var i=n[e];if(i&&typeof i=="object"&&typeof i.length=="number"&&(it(i)||j(i))){r||(i=h(i,r,t));var f=-1,a=i.length,c=o.length;for(o.length+=a;++f<a;)o[c++]=i[f]
-}else t||o.push(i)}return o}function y(n,t,e,u){if(n===t)return 0!==n||1/n==1/t;var o=typeof n,i=typeof t;if(n===n&&(!n||"function"!=o&&"object"!=o)&&(!t||"function"!=i&&"object"!=i))return false;if(null==n||null==t)return n===t;if(i=Mr.call(n),o=Mr.call(t),i!=o)return false;switch(i){case br:case dr:return+n==+t;case wr:return n!=+n?t!=+t:0==n?1/n==1/t:n==+t;case xr:case Tr:return n==t+""}if(o=i==_r,!o){var a=n instanceof f,c=t instanceof f;if(a||c)return y(a?n.__wrapped__:n,c?t.__wrapped__:t,e,u);if(i!=jr)return false;
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-});return e.pop(),u.pop(),l}function m(n,r,t){for(var e=-1,u=d(),o=n?n.length:0,i=[],f=t?[]:i;++e<o;){var a=n[e],c=t?t(a,e,n):a;(r?!e||f[f.length-1]!==c:0>u(f,c))&&(t&&f.push(c),i.push(a))}return i}function _(n){return function(r,t,e){var u={};t=Z(t,e,3),e=-1;var o=r?r.length:0;if(typeof o=="number")for(;++e<o;){var i=r[e];n(u,i,t(i,e,r),r)}else v(r,function(r,e,o){n(u,r,t(r,e,o),o)});return u}}function b(n,r,t,e,u){var o=r&pr,i=r&sr;if(!(r&ar||K(n)))throw new TypeError;return o&&!t.length&&(r&=-17,t=false),i&&!e.length&&(r&=-33,e=false),(r==fr||r==(fr|pr)?c:s)([n,r,t,e,u,void 0])
-}function d(){var n=(n=f.indexOf)===T?t:n;return n}function w(n){return typeof n=="function"&&Dr.test(Cr.call(n))}function j(n){return n&&typeof n=="object"&&typeof n.length=="number"&&Mr.call(n)==mr||false}function x(n,r,t){var e=0,u=n?n.length:0;if(typeof r!="number"&&null!=r){var o=-1;for(r=Z(r,t,3);++o<u&&r(n[o],o,n);)e++}else if(e=r,null==e||t)return n?n[0]:ur;return E(n,0,0<e?e:0)}function T(n,r,e){var u=n?n.length:0;if(typeof e=="number")e=0>e?Xr(0,u+e):e||0;else if(e)return e=O(n,r),u&&n[e]===r?e:-1;
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