diff --git a/build.js b/build.js
index 38aae7b9d..70dc46ed5 100755
--- a/build.js
+++ b/build.js
@@ -124,7 +124,7 @@
     'memoize': [],
     'merge': ['forOwn', 'isArray', 'isPlainObject'],
     'min': ['forEach', 'isArray', 'isString'],
-    'mixin': ['forEach', 'functions'],
+    'mixin': ['filter', 'forEach', 'functions'],
     'noConflict': [],
     'object': [],
     'omit': ['forIn', 'indexOf'],
@@ -1166,6 +1166,15 @@
           '  }'
         ].join('\n'));
 
+        // replace `_.chain`
+        source = source.replace(/^( *)function chain[\s\S]+?\n\1}/m, [
+          '  function chain(value) {',
+          '    value = new lodash(value);',
+          '    value.__chain__ = true;',
+          '    return value;',
+          '  }'
+        ].join('\n'));
+
         // replace `_.defaults`
         source = source.replace(/^( *)var defaults *= *createIterator[\s\S]+?\);/m, [
           '  function defaults(object) {',
@@ -1366,6 +1375,28 @@
           '  }'
         ].join('\n'));
 
+        // replace `wrapperChain`
+        source = source.replace(/^( *)function wrapperChain[\s\S]+?\n\1}/m, [
+          '  function wrapperChain() {',
+          '    this.__chain__ = true;',
+          '    return this;',
+          '  }'
+        ].join('\n'));
+
+        // add `__chain__` checks to `_.mixin` and Array function wrappers
+        source = source.replace(/^( *)forEach\([\s\S]+?\n\1}.+/gm, function(match) {
+          return match.replace(/^( *)return new lodash\(([^)]+)\).+/m, function(submatch, indent, varName) {
+            return indent + [
+              'if (this.__chain__) {',
+              '  varName = new lodash(varName);',
+              '  varName.__chain__ = true;',
+              '}',
+              'return varName;'
+            ].join('\n' + indent)
+            .replace(/varName/g, varName);
+          });
+        });
+
         // remove unneeded template related variables
         source = removeVar(source, 'reComplexDelimiter');
         source = removeVar(source, 'reEmptyStringLeading');
@@ -1382,6 +1413,14 @@
         // remove conditional `charCodeCallback` use from `_.max` and `_.min`
         source = source.replace(/!callback *&& *isString\(collection\)[\s\S]+?: */g, '');
 
+        // remove `lodash.prototype.toString` and `lodash.prototype.valueOf` assignments
+        source = source.replace(/ *lodash\.prototype\.(?:toString|valueOf) *=.+\n/g, '');
+
+        // remove `lodash.prototype` batch method assignments
+        source = source
+          .replace(/(?:\s*\/\/.*)*\n( *)forEach\(\['first'[\s\S]+?\n\1}.+/, '')
+          .replace(/(?:\s*\/\/.*)*\n( *)forEach\(filter[\s\S]+?lodash\.[\s\S]+?\n\1}.+/, '');
+
         // remove unused features from `createBound`
         if (buildMethods.indexOf('partial') == -1) {
           source = source.replace(matchFunction(source, 'createBound'), function(match) {
diff --git a/build/pre-compile.js b/build/pre-compile.js
index 2d56e4c6d..1eb78633b 100644
--- a/build/pre-compile.js
+++ b/build/pre-compile.js
@@ -59,7 +59,6 @@
   /** Used to protect the specified properties from getting minified */
   var propWhitelist = [
     '_',
-    '__chain__',
     '__wrapped__',
     'after',
     'all',
@@ -190,6 +189,9 @@
     'wrap',
     'zip',
 
+    // property used by the `lodash underscore` build
+    '__chain__',
+
     // properties used by underscore.js
     '_chain',
     '_wrapped'
diff --git a/doc/README.md b/doc/README.md
index eb0243679..911b9f85c 100644
--- a/doc/README.md
+++ b/doc/README.md
@@ -39,7 +39,8 @@
 * [`_.chain`](#_chainvalue)
 * [`_.tap`](#_tapvalue-interceptor)
 * [`_.prototype.chain`](#_prototypechain)
-* [`_.prototype.value`](#_prototypevalue)
+* [`_.prototype.toString`](#_prototypetostring)
+* [`_.prototype.valueOf`](#_prototypevalueof)
 
 <!-- /div -->
 
@@ -697,7 +698,7 @@ The `lodash` function.
 <!-- div -->
 
 ### <a id="_chainvalue"></a>`_.chain(value)`
-<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4009 "View in source") [&#x24C9;][1]
+<a href="#_chainvalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4005 "View in source") [&#x24C9;][1]
 
 Wraps the value in a `lodash` wrapper object.
 
@@ -731,7 +732,7 @@ var youngest = _.chain(stooges)
 <!-- div -->
 
 ### <a id="_tapvalue-interceptor"></a>`_.tap(value, interceptor)`
-<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4036 "View in source") [&#x24C9;][1]
+<a href="#_tapvalue-interceptor">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4030 "View in source") [&#x24C9;][1]
 
 Invokes `interceptor` with the `value` as the first argument, and then returns `value`. The purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain.
 
@@ -761,9 +762,9 @@ _.chain([1, 2, 3, 200])
 <!-- div -->
 
 ### <a id="_prototypechain"></a>`_.prototype.chain()`
-<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4054 "View in source") [&#x24C9;][1]
+<a href="#_prototypechain">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4052 "View in source") [&#x24C9;][1]
 
-Enables method chaining on the wrapper object.
+This function returns the wrapper object.  Note: This function is defined to ensure the existing wrapper object is returned, instead of creating a new wrapper object like the `_.chain` method does.
 
 #### Returns
 *(Mixed)*: Returns the wrapper object.
@@ -781,8 +782,29 @@ _([1, 2, 3]).value();
 
 <!-- div -->
 
-### <a id="_prototypevalue"></a>`_.prototype.value()`
-<a href="#_prototypevalue">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4071 "View in source") [&#x24C9;][1]
+### <a id="_prototypetostring"></a>`_.prototype.toString()`
+<a href="#_prototypetostring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4068 "View in source") [&#x24C9;][1]
+
+Produces the `toString` result of the wrapped value.
+
+#### Returns
+*(String)*: Returns the string result.
+
+#### Example
+```js
+_([1, 2, 3]).toString();
+// => '1,2,3'
+```
+
+* * *
+
+<!-- /div -->
+
+
+<!-- div -->
+
+### <a id="_prototypevalueof"></a>`_.prototype.valueOf()`
+<a href="#_prototypevalueof">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4084 "View in source") [&#x24C9;][1]
 
 Extracts the wrapped value.
 
@@ -2777,7 +2799,7 @@ _('curly').capitalize();
 <!-- div -->
 
 ### <a id="_noconflict"></a>`_.noConflict()`
-<a href="#_noconflict">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3666 "View in source") [&#x24C9;][1]
+<a href="#_noconflict">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3662 "View in source") [&#x24C9;][1]
 
 Reverts the '_' variable to its previous value and returns a reference to the `lodash` function.
 
@@ -2797,7 +2819,7 @@ var lodash = _.noConflict();
 <!-- div -->
 
 ### <a id="_randommin0-max1"></a>`_.random([min=0, max=1])`
-<a href="#_randommin0-max1">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3689 "View in source") [&#x24C9;][1]
+<a href="#_randommin0-max1">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3685 "View in source") [&#x24C9;][1]
 
 Produces a random number between `min` and `max` *(inclusive)*. If only one argument is passed, a number between `0` and the given number will be returned.
 
@@ -2825,7 +2847,7 @@ _.random(5);
 <!-- div -->
 
 ### <a id="_resultobject-property"></a>`_.result(object, property)`
-<a href="#_resultobject-property">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3727 "View in source") [&#x24C9;][1]
+<a href="#_resultobject-property">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3723 "View in source") [&#x24C9;][1]
 
 Resolves the value of `property` on `object`. If `property` is a function it will be invoked and its result returned, else the property value is returned. If `object` is falsey, then `null` is returned.
 
@@ -2860,7 +2882,7 @@ _.result(object, 'stuff');
 <!-- div -->
 
 ### <a id="_templatetext-data-options"></a>`_.template(text, data, options)`
-<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3812 "View in source") [&#x24C9;][1]
+<a href="#_templatetext-data-options">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3808 "View in source") [&#x24C9;][1]
 
 A micro-templating method that handles arbitrary delimiters, preserves whitespace, and correctly escapes quotes within interpolated code.  Note: In the development build `_.template` utilizes sourceURLs for easier debugging. See http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl  Note: Lo-Dash may be used in Chrome extensions by either creating a `lodash csp` build and avoiding `_.template` use, or loading Lo-Dash in a sandboxed page. See http://developer.chrome.com/trunk/extensions/sandboxingEval.html
 
@@ -2934,7 +2956,7 @@ fs.writeFileSync(path.join(cwd, 'jst.js'), '\
 <!-- div -->
 
 ### <a id="_timesn-callback--thisarg"></a>`_.times(n, callback [, thisArg])`
-<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3935 "View in source") [&#x24C9;][1]
+<a href="#_timesn-callback--thisarg">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3931 "View in source") [&#x24C9;][1]
 
 Executes the `callback` function `n` times, returning an array of the results of each `callback` execution. The `callback` is bound to `thisArg` and invoked with one argument; *(index)*.
 
@@ -2966,7 +2988,7 @@ _.times(3, function(n) { this.cast(n); }, mage);
 <!-- div -->
 
 ### <a id="_unescapestring"></a>`_.unescape(string)`
-<a href="#_unescapestring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3961 "View in source") [&#x24C9;][1]
+<a href="#_unescapestring">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3957 "View in source") [&#x24C9;][1]
 
 The opposite of `_.escape`, this method converts the HTML entities `&amp;`, `&lt;`, `&gt;`, `&quot;`, and `&#x27;` in `string` to their corresponding characters.
 
@@ -2990,7 +3012,7 @@ _.unescape('Moe, Larry &amp; Curly');
 <!-- div -->
 
 ### <a id="_uniqueidprefix"></a>`_.uniqueId([prefix])`
-<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3979 "View in source") [&#x24C9;][1]
+<a href="#_uniqueidprefix">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L3975 "View in source") [&#x24C9;][1]
 
 Generates a unique id. If `prefix` is passed, the id will be appended to it.
 
@@ -3021,7 +3043,7 @@ _.uniqueId('contact_');
 <!-- div -->
 
 ### <a id="_version"></a>`_.VERSION`
-<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4084 "View in source") [&#x24C9;][1]
+<a href="#_version">#</a> [&#x24C8;](https://github.com/bestiejs/lodash/blob/master/lodash.js#L4097 "View in source") [&#x24C9;][1]
 
 *(String)*: The semantic version number.
 
diff --git a/lodash.js b/lodash.js
index 57918f18b..131fca1a0 100644
--- a/lodash.js
+++ b/lodash.js
@@ -3642,11 +3642,7 @@
         push.apply(args, arguments);
 
         var result = func.apply(lodash, args);
-        if (this.__chain__) {
-          result = new lodash(result);
-          result.__chain__ = true;
-        }
-        return result;
+        return new lodash(result);
       };
     });
   }
@@ -4007,9 +4003,7 @@
    * // => 'moe is 40'
    */
   function chain(value) {
-    value = new lodash(value);
-    value.__chain__ = true;
-    return value;
+    return new lodash(value);
   }
 
   /**
@@ -4039,7 +4033,11 @@
   }
 
   /**
-   * Enables method chaining on the wrapper object.
+   * This function returns the wrapper object.
+   *
+   * Note: This function is defined to ensure the existing wrapper object is
+   * returned, instead of creating a new wrapper object like the `_.chain`
+   * method does.
    *
    * @name chain
    * @deprecated
@@ -4052,14 +4050,29 @@
    * // => [1, 2, 3]
    */
   function wrapperChain() {
-    this.__chain__ = true;
     return this;
   }
 
+  /**
+   * Produces the `toString` result of the wrapped value.
+   *
+   * @name toString
+   * @memberOf _
+   * @category Chaining
+   * @returns {String} Returns the string result.
+   * @example
+   *
+   * _([1, 2, 3]).toString();
+   * // => '1,2,3'
+   */
+  function wrapperToString() {
+    return String(this.__wrapped__);
+  }
+
   /**
    * Extracts the wrapped value.
    *
-   * @name value
+   * @name valueOf
    * @memberOf _
    * @category Chaining
    * @returns {Mixed} Returns the wrapped value.
@@ -4209,7 +4222,35 @@
   // add `lodash.prototype.chain` after calling `mixin()` to avoid overwriting
   // it with the wrapped `lodash.chain`
   lodash.prototype.chain = wrapperChain;
+  lodash.prototype.toString = wrapperToString;
   lodash.prototype.value = wrapperValue;
+  lodash.prototype.valueOf = wrapperValue;
+
+  // add methods that are capable of returning wrapped and unwrapped values
+  forEach(['first', 'last'], function(methodName) {
+    var func = lodash[methodName];
+    if (func) {
+      lodash.prototype[methodName] = function(n, guard) {
+        var result = func(this.__wrapped__, n, guard);
+        return (n == null || guard)
+          ? result
+          : new lodash(result);
+      };
+    }
+  });
+
+  // add all methods that return unwrapped values
+  forEach(filter(functions(lodash), function(methodName) {
+    return /^(?:contains|every|find|has|is[A-Z].+|reduce.*|some)$/.test(methodName);
+  }), function(methodName) {
+    var func = lodash[methodName];
+
+    lodash.prototype[methodName] = function() {
+      var args = [this.__wrapped__];
+      push.apply(args, arguments);
+      return func.apply(lodash, args);
+    };
+  });
 
   // add all mutator Array functions to the wrapper.
   forEach(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(methodName) {
@@ -4224,11 +4265,7 @@
       if (hasObjectSpliceBug && value.length === 0) {
         delete value[0];
       }
-      if (this.__chain__) {
-        value = new lodash(value);
-        value.__chain__ = true;
-      }
-      return value;
+      return this;
     };
   });
 
@@ -4240,11 +4277,7 @@
       var value = this.__wrapped__,
           result = func.apply(value, arguments);
 
-      if (this.__chain__) {
-        result = new lodash(result);
-        result.__chain__ = true;
-      }
-      return result;
+      return new lodash(result);
     };
   });
 
diff --git a/lodash.min.js b/lodash.min.js
index fdf4ac495..2c2e40928 100644
--- a/lodash.min.js
+++ b/lodash.min.js
@@ -2,39 +2,40 @@
  Lo-Dash 0.10.0 lodash.com/license
  Underscore.js 1.4.2 underscorejs.org/LICENSE
 */
-;(function(e,t){function s(e){if(e&&e.__wrapped__)return e;if(!(this instanceof s))return new s(e);this.__wrapped__=e}function o(e,t,n){t||(t=0);var r=e.length,i=r-t>=(n||Z);if(i)for(var s={},n=t-1;++n<r;){var o=e[n]+"";(bt.call(s,o)?s[o]:s[o]=[]).push(e[n])}return function(n){if(i){var r=n+"";return bt.call(s,r)&&-1<q(s[r],n)}return-1<q(e,n,t)}}function u(e){return e.charCodeAt(0)}function a(e,n){var r=e.b,i=n.b,e=e.a,n=n.a;if(e!==n){if(e>n||e===t)return 1;if(e<n||n===t)return-1}return r<i?-1:1}function f
-(e,t,n){function r(){var u=arguments,a=s?this:t;return i||(e=t[o]),n.length&&(u=u.length?n.concat(St.call(u)):n),this instanceof r?(d.prototype=e.prototype,a=new d,u=e.apply(a,u),T(u)?u:a):e.apply(a,u)}var i=x(e),s=!n,o=t;return s&&(n=t),i||(t=e),r}function l(e,n){return e?"function"!=typeof e?function(t){return t[e]}:n!==t?function(t,r,i){return e.call(n,t,r,i)}:e:X}function c(){for(var e={b:"",c:"",e:qt,f:Kt,g:"",h:zt,i:Xt,j:dt,k:"",l:n},t,r=0;t=arguments[r];r++)for(var i in t)e[i]=t[i];t=e.a,e
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+RegExp((n.escape||o.escape||ht).source+"|"+a.source+"|"+(a===ct?lt:ht).source+"|"+(n.evaluate||o.evaluate||ht).source+"|$","g"),function(t,n,i,s,o,a){i||(i=s),f+=e.slice(u,a).replace(dt,h),f+=n?"'+__e("+n+")+'":o?"';"+o+";__p+='":i?"'+((__t=("+i+"))==null?'':__t)+'":"",r||(r=o||nt.test(n||i)),u=a+t.length}),f+="';",c||(l="obj",r?f="with("+l+"){"+f+"}":(n=RegExp("(\\(\\s*)"+l+"\\."+l+"\\b","g"),f=f.replace(at,"$&"+l+".").replace(n,"$1__d"))),f=(r?f.replace(it,""):f).replace(st,"$1").replace(ot,"$1;"
+),f="function("+l+"){"+(c?"":l+"||("+l+"={});")+"var __t,__p='',__e=_.escape"+(r?",__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}":(c?"":",__d="+l+"."+l+"||"+l)+";")+f+"return __p}";try{i=Function("_","return "+f)(s)}catch(p){throw p.source=f,p}return t?i(t):(i.source=f,i)},s.throttle=function(e,t){function n(){a=new Date,u=r,s=e.apply(o,i)}var i,s,o,u,a=0;return function(){var r=new Date,f=t-(r-a);return i=arguments,o=this,0>=f?(clearTimeout(u),a=r,s=e.apply(o,i)):u||(u=setTimeout
+(n,f)),s}},s.times=function(e,t,n){for(var e=+e||0,r=-1,i=Array(e);++r<e;)i[r]=t.call(n,r);return i},s.toArray=function(e){var t=e?e.length:0;if("number"==typeof t){Vt&&N(e)&&(e=e.split(""));for(var n=-1,r=Array(t);++n<t;)r[n]=e[n];return r}return k(e)},s.unescape=function(e){return e==r?"":(e+"").replace(rt,v)},s.union=function(){return z(gt.apply(Q,arguments))},s.uniq=z,s.uniqueId=function(e){var t=Y++;return e?e+t:t},s.values=k,s.where=function(e,t){var n=hn(t);return O(e,function(e){for(var r=
+n.length;r--;){var i=e[n[r]]===t[n[r]];if(!i)break}return!!i})},s.without=function(e){for(var t=-1,n=e?e.length:0,r=o(arguments,1,20),i=[];++t<n;){var s=e[t];r(s)||i.push(s)}return i},s.wrap=function(e,t){return function(){var n=[e];return Et.apply(n,arguments),t.apply(this,n)}},s.zip=function(e){for(var t=-1,n=e?D(P(arguments,"length")):0,r=Array(n);++t<n;)r[t]=P(arguments,t);return r},s.all=A,s.any=j,s.collect=_,s.detect=M,s.drop=R,s.each=pn,s.extend=rn,s.foldl=H,s.foldr=B,s.head=F,s.include=L,
+s.inject=H,s.methods=w,s.select=O,s.tail=R,s.take=F,s.unique=z,V(s),s.prototype.chain=function(){return this},s.prototype.toString=function(){return""+this.__wrapped__},s.prototype.value=$,s.prototype.valueOf=$,pn(["first","last"],function(e){var t=s[e];t&&(s.prototype[e]=function(e,n){var i=t(this.__wrapped__,e,n);return e==r||n?i:new s(i)})}),pn(O(w(s),function(e){return/^(?:contains|every|find|has|is[A-Z].+|reduce.*|some)$/.test(e)}),function(e){var t=s[e];s.prototype[e]=function(){var e=[this
+.__wrapped__];return Et.apply(e,arguments),t.apply(s,e)}}),pn("pop push reverse shift sort splice unshift".split(" "),function(e){var t=Q[e];s.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),zt&&e.length===0&&delete e[0],this}}),pn(["concat","join","slice"],function(e){var t=Q[e];s.prototype[e]=function(){var e=t.apply(this.__wrapped__,arguments);return new s(e)}}),typeof define=="function"&&typeof define.amd=="object"&&define.amd?(e._=s,define(function(){return s})):J?"object"==typeof 
+module&&module&&module.exports==J?(module.exports=s)._=s:J._=s:e._=s})(this);
\ No newline at end of file
diff --git a/lodash.underscore.min.js b/lodash.underscore.min.js
index 367be8090..370782a21 100644
--- a/lodash.underscore.min.js
+++ b/lodash.underscore.min.js
@@ -28,5 +28,5 @@ n[r],n[r]=e}),n},n.size=function(e){var t=e?e.length:0;return"number"==typeof t?
 ,"g"),function(t,n,r,u,a){s+=e.slice(i,a).replace(K,o),s+=n?"'+_['escape']("+n+")+'":u?"';"+u+";__p+='":r?"'+((__t=("+r+"))==null?'':__t)+'":"",i=a+t.length}),s+="';",u||(u="obj",s="with("+u+"||{}){"+s+"}"),s="function("+u+"){var __t,__p='',__j=Array.prototype.join;function print(){__p+=__j.call(arguments,'')}"+s+"return __p}";try{var a=Function("_","return "+s)(n)}catch(f){throw f.source=s,f}return t?a(t):(a.source=s,a)},n.throttle=function(e,t){function n(){u=new Date,o=null,i=e.apply(s,r)}var r
 ,i,s,o,u=0;return function(){var a=new Date,f=t-(a-u);return r=arguments,s=this,0>=f?(clearTimeout(o),u=a,i=e.apply(s,r)):o||(o=setTimeout(n,f)),i}},n.times=function(e,t,n){for(var e=+e||0,r=-1,i=Array(e);++r<e;)i[r]=t.call(n,r);return i},n.toArray=function(e){var t=e?e.length:0;if("number"==typeof t){for(var n=-1,r=Array(t);++n<t;)r[n]=e[n];return r}return b(e)},n.unescape=function(e){return null==e?"":(e+"").replace(X,f)},n.union=function(){return H(G.apply(R,arguments))},n.uniq=H,n.uniqueId=function(
 e){var t=U++;return e?e+t:t},n.values=b,n.where=function(e,t){var n=Ct(t);return S(e,function(e){for(var r=n.length;r--;){var i=e[n[r]]===t[n[r]];if(!i)break}return!!i})},n.without=function(e){for(var t=-1,n=e.length,r=[];++t<n;){var i=e[t];0>_(arguments,i,1)&&r.push(i)}return r},n.wrap=function(e,t){return function(){var n=[e];return et.apply(n,arguments),t.apply(this,n)}},n.zip=function(e){for(var t=-1,n=e?N(C(arguments,"length")):0,r=Array(n);++t<n;)r[t]=C(arguments,t);return r},n.all=E,n.any=
-A,n.collect=T,n.detect=x,n.drop=D,n.each=kt,n.extend=l,n.foldl=k,n.foldr=L,n.head=O,n.include=w,n.inject=k,n.methods=p,n.select=S,n.tail=D,n.take=O,n.unique=H,F(n),n.prototype.chain=function(){return this.__chain__=!0,this},n.prototype.value=function(){return this.__wrapped__},kt("pop push reverse shift sort splice unshift".split(" "),function(e){var t=R[e];n.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),gt&&e.length===0&&delete e[0],this.__chain__&&(e=new n(e),e.__chain__=!0
-),e}}),kt(["concat","join","slice"],function(e){var t=R[e];n.prototype[e]=function(){var e=t.apply(this.__wrapped__,arguments);return this.__chain__&&(e=new n(e),e.__chain__=!0),e}}),I?"object"==typeof module&&module&&module.exports==I?(module.exports=n)._=n:I._=n:e._=n})(this);
\ No newline at end of file
+A,n.collect=T,n.detect=x,n.drop=D,n.each=kt,n.extend=l,n.foldl=k,n.foldr=L,n.head=O,n.include=w,n.inject=k,n.methods=p,n.select=S,n.tail=D,n.take=O,n.unique=H,F(n),n.prototype.chain=function(){return this.__chain__=!0,this},n.prototype.value=function(){return this.__wrapped__},kt("pop push reverse shift sort splice unshift".split(" "),function(e){var t=R[e];n.prototype[e]=function(){var e=this.__wrapped__;return t.apply(e,arguments),gt&&e.length===0&&delete e[0],this}}),kt(["concat","join","slice"
+],function(e){var t=R[e];n.prototype[e]=function(){var e=t.apply(this.__wrapped__,arguments);return this.__chain__&&(e=new n(e),e.__chain__=!0),e}}),I?"object"==typeof module&&module&&module.exports==I?(module.exports=n)._=n:I._=n:e._=n})(this);
\ No newline at end of file
diff --git a/test/test-build.js b/test/test-build.js
index 8fb370697..35cc45ec7 100644
--- a/test/test-build.js
+++ b/test/test-build.js
@@ -695,6 +695,14 @@
         equal(lodash.some([false, true, false]), true, '_.some: ' + basename);
         equal(lodash.template('${a}', object), '${a}', '_.template should ignore ES6 delimiters: ' + basename);
 
+        var wrapped = lodash(1);
+        equal(wrapped.clone() instanceof lodash, false, '_(...) wrapped values are not chainable by default: ' + basename);
+        equal(String(wrapped) === '1', false, '_#toString should not be implemented: ' + basename);
+        equal(Number(wrapped) === 1 , false, '_#valueOf should not be implemented: ' + basename);
+
+        wrapped.chain();
+        equal(wrapped.has('x') instanceof lodash, true, '_#has returns wrapped values when chaining: ' + basename);
+
         start();
       });
     });
diff --git a/test/test.js b/test/test.js
index b73b24bed..c7b251ee5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1936,7 +1936,7 @@
       var wrapped = _({ '0': 1, 'length': 1 });
       wrapped.shift();
 
-      deepEqual(wrapped.keys(), ['length']);
+      deepEqual(wrapped.keys().value(), ['length']);
       equal(wrapped.first(), undefined);
     });
   }());
@@ -1950,13 +1950,107 @@
       var wrapped = _({ '0': 1, 'length': 1 });
       wrapped.splice(0, 1);
 
-      deepEqual(wrapped.keys(), ['length']);
+      deepEqual(wrapped.keys().value(), ['length']);
       equal(wrapped.first(), undefined);
     });
   }());
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash(...).toString');
+
+  (function() {
+    test('should return the `toString` result of the wrapped value', function() {
+      var wrapped = _([1, 2, 3]);
+      equal(String(wrapped), '1,2,3');
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
+  QUnit.module('lodash(...).valueOf');
+
+  (function() {
+    test('should return the `valueOf` result of the wrapped value', function() {
+      var wrapped = _(123);
+      equal(Number(wrapped), 123);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
+  QUnit.module('lodash(...) methods capable of returning wrapped and unwrapped values');
+
+  (function() {
+    var array = [1, 2, 3],
+        wrapped = _(array);
+
+    var funcs = [
+      'first',
+      'last'
+    ];
+
+    _.each(funcs, function(methodName) {
+      test('_.' + methodName + ' should return an unwrapped value', function() {
+        equal(typeof wrapped[methodName](), 'number');
+      });
+
+      test('_.' + methodName + ' should return a wrapped value', function() {
+        ok(wrapped[methodName](1) instanceof _);
+      });
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
+  QUnit.module('lodash(...) methods that return unwrapped values');
+
+  (function() {
+    var array = [1, 2, 3],
+        wrapped = _(array);
+
+    var funcs = [
+      'contains',
+      'every',
+      'find',
+      'first',
+      'has',
+      'isArguments',
+      'isArray',
+      'isBoolean',
+      'isDate',
+      'isElement',
+      'isEmpty',
+      'isEqual',
+      'isFinite',
+      'isFunction',
+      'isNaN',
+      'isNull',
+      'isNumber',
+      'isObject',
+      'isPlainObject',
+      'isRegExp',
+      'isString',
+      'isUndefined',
+      'last',
+      'reduce',
+      'reduceRight',
+      'some'
+    ];
+
+    _.each(funcs, function(methodName) {
+      test('_.' + methodName + ' should return unwrapped values', function() {
+        var result = methodName == 'reduceRight'
+          ? wrapped[methodName](_.identity)
+          : wrapped[methodName];
+
+        notEqual(typeof result, 'object', '_.' + methodName + ' returns unwrapped values');
+      });
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash methods');
 
   (function() {