diff --git a/build.js b/build.js
index 48e762e8d..1857cf35f 100755
--- a/build.js
+++ b/build.js
@@ -512,10 +512,10 @@
     source = source.replace(getMethodAssignments(source), function(match) {
       var indent = /^ *(?=lodash\.)/m.exec(match)[0];
       return match + [
-        '',
         '',
         '// add functions to `lodash.prototype`',
-        'mixin(lodash);'
+        'mixin(lodash);',
+        ''
       ].join('\n' + indent);
     });
 
@@ -543,8 +543,9 @@
       }
       // add quotes to commands with spaces or equals signs
       commands = _.map(commands, function(command) {
-        var separator = (command.match(/[= ]/) || [''])[0];
+        var separator = command.match(/[= ]/);
         if (separator) {
+          separator = separator[0];
           var pair = command.split(separator);
           command = pair[0] + separator + '"' + pair[1] + '"';
         }
@@ -691,7 +692,7 @@
         return separators.match(/^\s*/)[0] + separators.slice(separators.lastIndexOf('/*'));
       })
       // remove unneeded horizontal rule comment separators
-      .replace(/(\{\n)\s*\/\*-+\*\/\n/g, '$1');
+      .replace(/(\{\n)\s*\/\*-+\*\/\n|\n *\/\*-+\*\/\n(\s*\})/gm, '$1$2');
   }
 
   /**
@@ -891,7 +892,8 @@
    * @returns {String} Returns the `isArguments` fallback.
    */
   function getIsArgumentsFallback(source) {
-    return (source.match(/(?:\s*\/\/.*)*\n( *)if *\((?:!support\.argsClass|!isArguments)[\s\S]+?\n *};\n\1}/) || [''])[0];
+    var result = source.match(/(?:\s*\/\/.*)*\n( *)if *\((?:!support\.argsClass|!isArguments)[\s\S]+?\n *};\n\1}/);
+    return result ? result[0] : '';
   }
 
   /**
@@ -915,7 +917,8 @@
    * @returns {String} Returns the `isFunction` fallback.
    */
   function getIsFunctionFallback(source) {
-    return (source.match(/(?:\s*\/\/.*)*\n( *)if *\(isFunction\(\/x\/[\s\S]+?\n *};\n\1}/) || [''])[0];
+    var result = source.match(/(?:\s*\/\/.*)*\n( *)if *\(isFunction\(\/x\/[\s\S]+?\n *};\n\1}/);
+    return result ? result[0] : '';
   }
 
   /**
@@ -926,7 +929,8 @@
    * @returns {String} Returns the `isArguments` fallback.
    */
   function getCreateObjectFallback(source) {
-    return (source.match(/(?:\s*\/\/.*)*\n( *)if *\((?:!nativeCreate)[\s\S]+?\n *};\n\1}/) || [''])[0];
+    var result = source.match(/(?:\s*\/\/.*)*\n( *)if *\((?:!nativeCreate)[\s\S]+?\n *};\n\1}/);
+    return result ? result[0] : '';
   }
 
   /**
@@ -937,7 +941,8 @@
    * @returns {String} Returns the `iteratorTemplate`.
    */
   function getIteratorTemplate(source) {
-    return (source.match(/^( *)var iteratorTemplate *= *[\s\S]+?\n\1.+?;\n/m) || [''])[0];
+    var result = source.match(/^( *)var iteratorTemplate *= *[\s\S]+?\n\1.+?;\n/m);
+    return result ? result[0] : '';
   }
 
   /**
@@ -948,7 +953,13 @@
    * @returns {String} Returns the method assignments snippet.
    */
   function getMethodAssignments(source) {
-    return (source.match(/\/\*-+\*\/\n(?:\s*\/\/.*)*\s*lodash\.\w+ *=[\s\S]+?lodash\.VERSION *=.+/) || [''])[0];
+    var result = source.match(RegExp(
+      '/\\*-+\\*/\\n' +
+      '(?:\\s*//.*)*\\s*lodash\\.\\w+ *=[\\s\\S]+?\\n' +
+      '(?=\\s*/\\*-+\\*/\\n\\s*' + multilineComment + ' *lodash\\.VERSION *=)'
+    ));
+
+    return result ? result[0] : '';
   }
 
   /**
@@ -980,6 +991,22 @@
     ) || methodName;
   }
 
+  /**
+   * Gets the `support` object assignment snippet from `source`.
+   *
+   * @private
+   * @param {String} source The source to inspect.
+   * @returns {String} Returns the `support` snippet.
+   */
+  function getSupport(source) {
+    var result = source.match(RegExp(
+      multilineComment +
+      '( *)var support *=[\\s\\S]+?\n\\1}\\(1\\)\\);\\n'
+    , 'm'));
+
+    return result ? result[0] : '';
+  }
+
   /**
    * Creates a sorted array of all variables defined outside of Lo-Dash methods.
    *
@@ -1293,7 +1320,6 @@
     return source;
   }
 
-
   /**
    * Removes the `Object.keys` object iteration optimization from `source`.
    *
@@ -1332,18 +1358,64 @@
   }
 
   /**
-   * Removes all `support.argsObject` references from `source`.
+   * Removes all `runInContext` references from `source`.
    *
    * @private
    * @param {String} source The source to process.
    * @returns {String} Returns the modified source.
    */
-  function removeSupportArgsObject(source) {
-    source = removeSupportProp(source, 'argsObject');
+  function removeRunInContext(source) {
+    // replace reference in `reThis` assignment
+    source = source.replace(/\btest\(runInContext\)/, 'test(function() { return this; })');
 
-    // remove `argsAreObjects` from `_.isEqual`
-    source = source.replace(matchFunction(source, 'isEqual'), function(match) {
-      return match.replace(/!support.\argsObject[^:]+:\s*/g, '');
+    // remove function scaffolding, leaving most of its content
+    source = source.replace(matchFunction(source, 'runInContext'), function(match) {
+      return match
+        .replace(/^[\s\S]+?function runInContext[\s\S]+?context *= *context.+| *return lodash[\s\S]+$/g, '')
+        .replace(/^ {4}/gm, '  ');
+    });
+
+    // cleanup adjusted source
+    source = source
+      .replace(/\bcontext\b/g, 'window')
+      .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var Array *=[\s\S]+?;\n/, '')
+      .replace(/(return *|= *)_([;)])/g, '$1lodash$2')
+      .replace(/^ *var _ *=.+\n+/m, '');
+
+    return source;
+  }
+
+  /**
+   * Removes all `setImmediate` references from `source`.
+   *
+   * @private
+   * @param {String} source The source to process.
+   * @returns {String} Returns the modified source.
+   */
+  function removeSetImmediate(source) {
+    // remove the `setImmediate` fork of `_.defer`.
+    source = source.replace(/(?:\s*\/\/.*)*\n( *)if *\(isV8 *&& *freeModule[\s\S]+?\n\1}/, '');
+
+    return source;
+  }
+
+  /**
+   * Removes all `support` object references from `source`.
+   *
+   * @private
+   * @param {String} source The source to process.
+   * @returns {String} Returns the modified source.
+   */
+  function removeSupport(source) {
+    source = source.replace(getSupport(source), '');
+
+    _.each([
+      removeSupportArgsClass, removeSupportArgsObject, removeSupportEnumErrorProps,
+      removeSupportEnumPrototypes, removeSupportNodeClass, removeSupportNonEnumArgs,
+      removeSupportNonEnumShadows, removeSupportOwnLast, removeSupportSpliceObjects,
+      removeSupportUnindexedChars
+    ], function(func) {
+      source = func(source);
     });
 
     return source;
@@ -1379,6 +1451,24 @@
     return source;
   }
 
+  /**
+   * Removes all `support.argsObject` references from `source`.
+   *
+   * @private
+   * @param {String} source The source to process.
+   * @returns {String} Returns the modified source.
+   */
+  function removeSupportArgsObject(source) {
+    source = removeSupportProp(source, 'argsObject');
+
+    // remove `argsAreObjects` from `_.isEqual`
+    source = source.replace(matchFunction(source, 'isEqual'), function(match) {
+      return match.replace(/!support.\argsObject[^:]+:\s*/g, '');
+    });
+
+    return source;
+  }
+
   /**
    * Removes all `support.enumErrorProps` references from `source`.
    *
@@ -1399,7 +1489,6 @@
     return source;
   }
 
-
   /**
    * Removes all `support.enumPrototypes` references from `source`.
    *
@@ -1572,48 +1661,6 @@
     return source;
   }
 
-  /**
-   * Removes all `runInContext` references from `source`.
-   *
-   * @private
-   * @param {String} source The source to process.
-   * @returns {String} Returns the modified source.
-   */
-  function removeRunInContext(source) {
-    // replace reference in `reThis` assignment
-    source = source.replace(/\btest\(runInContext\)/, 'test(function() { return this; })');
-
-    // remove function scaffolding, leaving most of its content
-    source = source.replace(matchFunction(source, 'runInContext'), function(match) {
-      return match
-        .replace(/^[\s\S]+?function runInContext[\s\S]+?context *= *context.+| *return lodash[\s\S]+$/g, '')
-        .replace(/^ {4}/gm, '  ');
-    });
-
-    // cleanup adjusted source
-    source = source
-      .replace(/\bcontext\b/g, 'window')
-      .replace(/(?:\n +\/\*[^*]*\*+(?:[^\/][^*]*\*+)*\/)?\n *var Array *=[\s\S]+?;\n/, '')
-      .replace(/(return *|= *)_([;)])/g, '$1lodash$2')
-      .replace(/^ *var _ *=.+\n+/m, '');
-
-    return source;
-  }
-
-  /**
-   * Removes all `setImmediate` references from `source`.
-   *
-   * @private
-   * @param {String} source The source to process.
-   * @returns {String} Returns the modified source.
-   */
-  function removeSetImmediate(source) {
-    // remove the `setImmediate` fork of `_.defer`.
-    source = source.replace(/(?:\s*\/\/.*)*\n( *)if *\(isV8 *&& *freeModule[\s\S]+?\n\1}/, '');
-
-    return source;
-  }
-
   /**
    * Removes a given property from the `support` object in `source`.
    *
@@ -1623,15 +1670,17 @@
    * @returns {String} Returns the modified source.
    */
   function removeSupportProp(source, propName) {
-    return source.replace(RegExp(
-      multilineComment +
-      // match a `try` block
-      '(?: *try\\b.+\\n)?' +
-      // match the `support` property assignment
-      ' *support\\.' + propName + ' *=.+\\n' +
-      // match `catch` block
-      '(?:( *).+?catch\\b[\\s\\S]+?\\n\\1}\\n)?'
-    ), '');
+    return source.replace(getSupport(source), function(match) {
+      return match.replace(RegExp(
+        multilineComment +
+        // match a `try` block
+        '(?: *try\\b.+\\n)?' +
+        // match the `support` property assignment
+        ' *support\\.' + propName + ' *=.+\\n' +
+        // match `catch` block
+        '(?:( *).+?catch\\b[\\s\\S]+?\\n\\1}\\n)?'
+      ), '');
+    });
   }
 
   /**
@@ -3199,7 +3248,7 @@
 
             _.each(['assign', 'createCallback', 'forIn', 'forOwn', 'isPlainObject', 'unzip', 'zipObject'], function(methodName) {
               if (!useLodashMethod(methodName)) {
-                modified = modified.replace(RegExp('^(?: *//.*\\s*)* *lodash\\.' + methodName + ' *=.+\\n', 'm'), '');
+                modified = modified.replace(RegExp('^(?: *//.*\\s*)* *lodash\\.' + methodName + ' *=[\\s\\S]+?;\\n', 'm'), '');
               }
             });
 
@@ -3321,6 +3370,7 @@
       }
       if (isRemoved(source, 'isArguments')) {
         source = replaceSupportProp(source, 'argsClass', 'true');
+        source = removeIsArgumentsFallback(source);
       }
       if (isRemoved(source, 'isArguments', 'isEmpty')) {
         source = removeSupportArgsClass(source);
@@ -3428,30 +3478,33 @@
       }
 
       // remove code used to resolve unneeded `support` properties
-      source = source.replace(/^ *\(function[\s\S]+?\n(( *)var ctor *= *function[\s\S]+?(?:\n *for.+)+\n)([\s\S]+?)}\(1\)\);\n/m, function(match, setup, indent, body) {
-        var modified = setup;
-        if (!/support\.spliceObjects *=(?! *(?:false|true))/.test(match)) {
-          modified = modified.replace(/^ *object *=.+\n/m, '');
-        }
-        if (!/support\.enumPrototypes *=(?! *(?:false|true))/.test(match) &&
-            !/support\.nonEnumShadows *=(?! *(?:false|true))/.test(match) &&
-            !/support\.ownLast *=(?! *(?:false|true))/.test(match)) {
-          modified = modified
-            .replace(/\bctor *=.+\s+/, '')
-            .replace(/^ *ctor\.prototype.+\s+.+\n/m, '')
-            .replace(/(?:,\n)? *props *=[^;=]+/, '')
-            .replace(/^ *for *\((?=prop)/, '$&var ')
-        }
-        if (!/support\.nonEnumArgs *=(?! *(?:false|true))/.test(match)) {
-          modified = modified.replace(/^ *for *\(.+? arguments.+\n/m, '');
-        }
-        // cleanup the empty var statement
-        modified = modified.replace(/^ *var;\n/m, '');
+      source = source.replace(getSupport(source), function(match) {
+        return match.replace(/^ *\(function[\s\S]+?\n(( *)var ctor *=[\s\S]+?(?:\n *for.+)+\n)([\s\S]+?)}\(1\)\);\n/m, function(match, setup, indent, body) {
+          var modified = setup;
 
-        // if no setup then remove IIFE
-        return /^\s*$/.test(modified)
-          ? body.replace(RegExp('^' + indent, 'gm'), indent.slice(0, -2))
-          : match.replace(setup, modified);
+          if (!/support\.spliceObjects *=(?! *(?:false|true))/.test(body)) {
+            modified = modified.replace(/^ *object *=.+\n/m, '');
+          }
+          if (!/support\.enumPrototypes *=(?! *(?:false|true))/.test(body) &&
+              !/support\.nonEnumShadows *=(?! *(?:false|true))/.test(body) &&
+              !/support\.ownLast *=(?! *(?:false|true))/.test(body)) {
+            modified = modified
+              .replace(/\bctor *=.+\s+/, '')
+              .replace(/^ *ctor\.prototype.+\s+.+\n/m, '')
+              .replace(/(?:,\n)? *props *=[^;=]+/, '')
+              .replace(/^ *for *\((?=prop)/, '$&var ')
+          }
+          if (!/support\.nonEnumArgs *=(?! *(?:false|true))/.test(body)) {
+            modified = modified.replace(/^ *for *\(.+? arguments.+\n/m, '');
+          }
+          // cleanup the empty var statement
+          modified = modified.replace(/^ *var;\n/m, '');
+
+          // if no setup then remove IIFE
+          return /^\s*$/.test(modified)
+            ? body.replace(RegExp('^' + indent, 'gm'), indent.slice(0, -2))
+            : match.replace(setup, modified);
+        });
       });
 
       // remove unused variables
@@ -3471,7 +3524,7 @@
             varNames.shift();
           }
           else {
-            while (!useMap[varNames[0]]) {
+            while (varNames.length && !useMap[varNames[0]]) {
               source = removeVar(source, varNames[0]);
               varNames.shift();
             }
diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 253a3174c..f6b46b3d0 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -4386,6 +4386,9 @@
   lodash.take = first;
   lodash.head = first;
 
+  // add functions to `lodash.prototype`
+  mixin(lodash);
+
   /*--------------------------------------------------------------------------*/
 
   /**
@@ -4397,9 +4400,6 @@
    */
   lodash.VERSION = '1.3.1';
 
-  // add functions to `lodash.prototype`
-  mixin(lodash);
-
   // add "Chaining" functions to the wrapper
   lodash.prototype.chain = wrapperChain;
   lodash.prototype.value = wrapperValueOf;
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 7d6d54a92..c8923adeb 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -4,32 +4,32 @@
  * Build: `lodash underscore exports="amd,commonjs,global,node" -o ./dist/lodash.underscore.js`
  * Underscore.js 1.4.4 underscorejs.org/LICENSE
  */
-;!function(n){function t(n,t){var r;if(n&&gt[typeof n])for(r in n)if(Et.call(n,r)&&t(n[r],r,n)===nt)break}function r(n,t){var r;if(n&&gt[typeof n])for(r in n)if(t(n[r],r,n)===nt)break}function e(n){var t,r=[];if(!n||!gt[typeof n])return r;for(t in n)Et.call(n,t)&&r.push(t);return r}function u(n,t,r){r=(r||0)-1;for(var e=n.length;++r<e;)if(n[r]===t)return r;return-1}function o(n,t){var r=n.m,e=t.m;if(n=n.l,t=t.l,n!==t){if(n>t||typeof n=="undefined")return 1;if(n<t||typeof t=="undefined")return-1}return r<e?-1:1
-}function i(n){return"\\"+ht[n]}function a(){}function f(n){return n instanceof f?n:new c(n)}function c(n){this.__wrapped__=n}function l(n,t,r){function e(){var f=arguments,c=o?this:t;return u||(n=t[i]),r.length&&(f=f.length?(f=zt.call(f),a?f.concat(r):r.concat(f)):r),this instanceof e?(c=p(n.prototype),f=n.apply(c,f),A(f)?f:c):n.apply(c,f)}var u=w(n),o=!r,i=t;if(o){var a=void 0;r=t}else if(!u)throw new TypeError;return e}function p(n){return A(n)?Ft(n):{}}function s(n){return Wt[n]}function v(){var n=(n=f.indexOf)===U?u:n;
-return n}function g(n){return Gt[n]}function h(n){return kt.call(n)==it}function y(n){if(!n)return n;for(var t=1,r=arguments.length;t<r;t++){var e=arguments[t];if(e)for(var u in e)n[u]=e[u]}return n}function m(n){if(!n)return n;for(var t=1,r=arguments.length;t<r;t++){var e=arguments[t];if(e)for(var u in e)n[u]==X&&(n[u]=e[u])}return n}function _(n){var t=[];return r(n,function(n,r){w(n)&&t.push(r)}),t.sort()}function d(n){for(var t=-1,r=Vt(n),e=r.length,u={};++t<e;){var o=r[t];u[n[o]]=o}return u}function b(n){if(!n)return Q;
-if(Ut(n)||O(n))return!n.length;for(var t in n)if(Et.call(n,t))return Y;return Q}function j(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 Y;if(n==X||t==X)return n===t;if(i=kt.call(n),o=kt.call(t),i!=o)return Y;switch(i){case ft:case ct:return+n==+t;case lt:return n!=+n?t!=+t:0==n?1/n==1/t:n==+t;case st:case vt:return n==t+""}if(o=i==at,!o){if(n instanceof f||t instanceof f)return j(n.__wrapped__||n,t.__wrapped__||t,e,u);
-if(i!=pt)return Y;var i=n.constructor,a=t.constructor;if(i!=a&&(!w(i)||!(i instanceof i&&w(a)&&a instanceof a)))return Y}for(e||(e=[]),u||(u=[]),i=e.length;i--;)if(e[i]==n)return u[i]==t;var c=Q,l=0;if(e.push(n),u.push(t),o){if(l=t.length,c=l==n.length)for(;l--&&(c=j(n[l],t[l],e,u)););return c}return r(t,function(t,r,o){return Et.call(o,r)?(l++,!(c=Et.call(n,r)&&j(n[r],t,e,u))&&nt):void 0}),c&&r(n,function(n,t,r){return Et.call(r,t)?!(c=-1<--l)&&nt:void 0}),c}function w(n){return typeof n=="function"
-}function A(n){return!(!n||!gt[typeof n])}function x(n){return typeof n=="number"||kt.call(n)==lt}function O(n){return typeof n=="string"||kt.call(n)==vt}function E(n){for(var t=-1,r=Vt(n),e=r.length,u=Array(e);++t<e;)u[t]=n[r[t]];return u}function S(n,r){var e=v(),u=n?n.length:0,o=Y;return u&&typeof u=="number"?o=-1<e(n,r):t(n,function(n){return(o=n===r)&&nt}),o}function N(n,r,e){var u=Q;r=J(r,e),e=-1;var o=n?n.length:0;if(typeof o=="number")for(;++e<o&&(u=!!r(n[e],e,n)););else t(n,function(n,t,e){return!(u=!!r(n,t,e))&&nt
-});return u}function k(n,r,e){var u=[];r=J(r,e),e=-1;var o=n?n.length:0;if(typeof o=="number")for(;++e<o;){var i=n[e];r(i,e,n)&&u.push(i)}else t(n,function(n,t,e){r(n,t,e)&&u.push(n)});return u}function B(n,r,e){r=J(r,e),e=-1;var u=n?n.length:0;if(typeof u!="number"){var o;return t(n,function(n,t,e){return r(n,t,e)?(o=n,nt):void 0}),o}for(;++e<u;){var i=n[e];if(r(i,e,n))return i}}function F(n,r,e){var u=-1,o=n?n.length:0;if(r=r&&typeof e=="undefined"?r:J(r,e),typeof o=="number")for(;++u<o&&r(n[u],u,n)!==nt;);else t(n,r)
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