diff --git a/build.js b/build.js
index 8a42d43cb..a9ab678c8 100755
--- a/build.js
+++ b/build.js
@@ -1689,7 +1689,9 @@
         ], function(data) {
           if (!data.flag) {
             source = source.replace(matchFunction(source, data.methodName), function(match) {
-              return match.replace(/(callback), *thisArg/g, '$1');
+              return match
+                .replace(/(callback), *thisArg/g, '$1')
+                .replace(/^ *callback *=.+/m, 'callback || (callback = identity);')
             });
           }
         });
diff --git a/build/pre-compile.js b/build/pre-compile.js
index 5efbc498f..c53401cb6 100644
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -30,7 +30,7 @@
     'skipProto',
     'source',
     'thisArg',
-    'value'
+    'undefined'
   ];
 
   /** Used to minify `compileIterator` option properties */
@@ -221,7 +221,9 @@
 
     // add brackets to whitelisted properties so the Closure Compiler won't mung them
     // http://code.google.com/closure/compiler/docs/api-tutorial3.html#export
-    source = source.replace(RegExp('\\.(' + propWhitelist.join('|') + ')\\b', 'g'), "['$1']");
+    source = source.replace(RegExp('\\.(' + propWhitelist.join('|') + ')\\b', 'g'), function(match, prop) {
+      return "['" + prop.replace(/['\n\r\t]/g, '\\$&') + "']";
+    });
 
     // remove brackets from `_.escape()` in `_.template`
     source = source.replace(/__e *= *_\['escape']/g, '__e=_.escape');
@@ -236,19 +238,17 @@
     source = source.replace("result[length]['value']", 'result[length].value');
 
     // remove whitespace from string literals
-    source = source.replace(/^ *"(?:(?=(\\?))\1.)*?"|'(?:(?=(\\?))\2.)*?'/gm, function(string) {
+    source = source.replace(/^([ "'\w]+:)? *"(?:(?=(\\?))\2.)*?"|'(?:(?=(\\?))\3.)*?'/gm, function(string, captured) {
+      // remove object literal property name
+      if (/:$/.test(captured)) {
+        string = string.slice(captured.length);
+      }
       // avoids removing the '\n' of the `stringEscapes` object
-      return string.replace(/\[object |delete |else |function | in |return\s+[\w"']|throw |typeof |use strict|var |@ |(["'])\\n\1|\\\\n|\\n|\s+/g, function(match) {
-        return match == false || match == '\\n' ? '' : match;
-      });
-    });
-
-    // remove whitespace from string literals in double quotes
-    source = source.replace(/^ *"(?:(?=(\\?))\1.)*?"/g, function(string) {
-      // avoids removing the '\n' of the `stringEscapes` object
-      return string.replace(reWhitespace, function(match) {
+      string = string.replace(/\[object |delete |else |function | in |return\s+[\w"']|throw |typeof |use strict|var |@ |(["'])\\n\1|\\\\n|\\n|\s+/g, function(match) {
         return match == false || match == '\\n' ? '' : match;
       });
+      // prepend object literal property name
+      return (captured || '') + string;
     });
 
     // add newline to `+"__p+='"` in underscore.js `_.template`
@@ -325,7 +325,7 @@
           isIteratorTemplate = /var iteratorTemplate\b/.test(snippet),
           modified = snippet;
 
-      // add brackets to whitelisted properties so the Closure Compiler won't mung them
+      // add brackets to iterator option properties so the Closure Compiler won't mung them
       modified = modified.replace(RegExp('\\.(' + iteratorOptions.join('|') + ')\\b', 'g'), function(match, prop) {
         return "['" + prop.replace(/['\n\r\t]/g, '\\$&') + "']";
       });
@@ -342,9 +342,9 @@
         // ensure properties in compiled strings aren't minified
         modified = modified.replace(RegExp('([^.]\\b)' + variable + '\\b(?!\' *[\\]:])', 'g'), '$1' + minNames[index]);
 
-        // correct `typeof x == 'object'`
-        if (variable == 'object') {
-          modified = modified.replace(RegExp("(typeof [^']+')" + minNames[index] + "'", 'g'), "$1object'");
+        // correct `typeof` of 'object' and 'undefined'
+        if (variable == 'object' || variable == 'undefined') {
+          modified = modified.replace(RegExp("(typeof [^']+')" + minNames[index] + "'", 'g'), '$1' + variable + "'");
         }
       });
 
diff --git a/doc/README.md b/doc/README.md
index ea6d5334d..c02ed75ee 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -2325,7 +2325,7 @@ _.isFunction(_);
 ### <a id="_isnanvalue"></a>`_.isNaN(value)`
 <a href="#_isnanvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L1482 "View in source") [&#x24C9;][1]
 
-Checks if `value` is `NaN`.  Note: This is not the same as native `isNaN`, which will return true for `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
+Checks if `value` is `NaN`.  Note: This is not the same as native `isNaN`, which will return `true` for `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
 
 #### Arguments
 1. `value` *(Mixed)*: The value to check.
diff --git a/lodash.js b/lodash.js
index 74e66aea5..e7251bae4 100644
--- a/lodash.js
+++ b/lodash.js
@@ -470,7 +470,7 @@
    */
   var forEachIteratorOptions = {
     'args': 'collection, callback, thisArg',
-    'top': 'callback = createCallback(callback, thisArg)',
+    'top': 'callback = callback && thisArg === undefined ? callback : createCallback(callback, thisArg)',
     'arrayLoop': 'if (callback(iteratee[index], index, collection) === false) return result',
     'objectLoop': 'if (callback(iteratee[index], index, collection) === false) return result'
   };
@@ -682,7 +682,7 @@
     // create the function factory
     var factory = createFunction(
         'createCallback, hasOwnProperty, isArguments, isString, objectTypes, ' +
-        'nativeKeys, propertyIsEnumerable',
+        'nativeKeys, propertyIsEnumerable, undefined',
       'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}'
     );
     // return the compiled function
@@ -1457,7 +1457,7 @@
   /**
    * Checks if `value` is `NaN`.
    *
-   * Note: This is not the same as native `isNaN`, which will return true for
+   * Note: This is not the same as native `isNaN`, which will return `true` for
    * `undefined` and other values. See http://es5.github.com/#x15.1.2.4.
    *
    * @static
diff --git a/lodash.min.js b/lodash.min.js
index 4ca80bfe3..9a229abe5 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -6,7 +6,7 @@
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