diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 601a814a5..037022e15 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -1090,24 +1090,30 @@
       if (typeof func != 'function') {
         return identity;
       }
-      // exit early if there is no `thisArg`
-      if (typeof thisArg == 'undefined') {
+      // exit early for no `thisArg` or already bound by `Function#bind`
+      if (typeof thisArg == 'undefined' || !('prototype' in func)) {
         return func;
       }
-      var bindData = func.__bindData__ || (support.funcNames && !func.name);
+      var bindData = func.__bindData__;
       if (typeof bindData == 'undefined') {
-        var source = reThis && fnToString.call(func);
-        if (!support.funcNames && source && !reFuncName.test(source)) {
-          bindData = true;
+        if (support.funcNames) {
+          bindData = !func.name;
         }
-        if (support.funcNames || !bindData) {
-          // checks if `func` references the `this` keyword and stores the result
-          bindData = !support.funcDecomp || reThis.test(source);
-          setBindData(func, bindData);
+        bindData = bindData || !support.funcDecomp;
+        if (!bindData) {
+          var source = fnToString.call(func);
+          if (!support.funcNames) {
+            bindData = !reFuncName.test(source);
+          }
+          if (!bindData) {
+            // checks if `func` references the `this` keyword and stores the result
+            bindData = reThis.test(source);
+            setBindData(func, bindData);
+          }
         }
       }
       // exit early if there are no `this` references or `func` is bound
-      if (bindData !== true && (bindData && bindData[1] & 1)) {
+      if (bindData === false || (bindData !== true && bindData[1] & 1)) {
         return func;
       }
       switch (argCount) {
@@ -1528,7 +1534,7 @@
         isPartialRight = partialRightArgs = false;
       }
       var bindData = func && func.__bindData__;
-      if (bindData) {
+      if (typeof bindData == 'object') {
         if (isBind && !(bindData[1] & 1)) {
           bindData[4] = thisArg;
         }
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index ae5a23e45..fae5d4525 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -7,36 +7,36 @@
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diff --git a/dist/lodash.js b/dist/lodash.js
index f3ce4a521..c8448f365 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -814,24 +814,30 @@
       if (typeof func != 'function') {
         return identity;
       }
-      // exit early if there is no `thisArg`
-      if (typeof thisArg == 'undefined') {
+      // exit early for no `thisArg` or already bound by `Function#bind`
+      if (typeof thisArg == 'undefined' || !('prototype' in func)) {
         return func;
       }
-      var bindData = func.__bindData__ || (support.funcNames && !func.name);
+      var bindData = func.__bindData__;
       if (typeof bindData == 'undefined') {
-        var source = reThis && fnToString.call(func);
-        if (!support.funcNames && source && !reFuncName.test(source)) {
-          bindData = true;
+        if (support.funcNames) {
+          bindData = !func.name;
         }
-        if (support.funcNames || !bindData) {
-          // checks if `func` references the `this` keyword and stores the result
-          bindData = !support.funcDecomp || reThis.test(source);
-          setBindData(func, bindData);
+        bindData = bindData || !support.funcDecomp;
+        if (!bindData) {
+          var source = fnToString.call(func);
+          if (!support.funcNames) {
+            bindData = !reFuncName.test(source);
+          }
+          if (!bindData) {
+            // checks if `func` references the `this` keyword and stores the result
+            bindData = reThis.test(source);
+            setBindData(func, bindData);
+          }
         }
       }
       // exit early if there are no `this` references or `func` is bound
-      if (bindData !== true && (bindData && bindData[1] & 1)) {
+      if (bindData === false || (bindData !== true && bindData[1] & 1)) {
         return func;
       }
       switch (argCount) {
@@ -1252,7 +1258,7 @@
         isPartialRight = partialRightArgs = false;
       }
       var bindData = func && func.__bindData__;
-      if (bindData) {
+      if (typeof bindData == 'object') {
         if (isBind && !(bindData[1] & 1)) {
           bindData[4] = thisArg;
         }
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 96e61e9b0..bb22f71e2 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
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+return n}function Nt(n,t,e){var r=n?n.length:0;if(t=t&&typeof e=="undefined"?t:et(t,e,3),typeof r=="number")for(;r--&&false!==t(n[r],r,n););else{var u=Ke(n),r=u.length;y(n,function(n,e,o){return e=u?u[--r]:--r,t(o[e],e,o)})}return n}function Et(n,t,e){var r=-1,u=n?n.length:0;if(t=Y.createCallback(t,e,3),typeof u=="number")for(var o=Xt(u);++r<u;)o[r]=t(n[r],r,n);else o=[],y(n,function(n,e,u){o[++r]=t(n,e,u)});return o}function St(n,t,e){var u=-1/0,o=u;if(!t&&Pe(n)){e=-1;for(var a=n.length;++e<a;){var i=n[e];
+i>o&&(o=i)}}else t=!t&&wt(n)?r:Y.createCallback(t,e,3),It(n,function(n,e,r){e=t(n,e,r),e>u&&(u=e,o=n)});return o}function Rt(n,t){var e=-1,r=n?n.length:0;if(typeof r=="number")for(var u=Xt(r);++e<r;)u[e]=n[e][t];return u||Et(n,t)}function At(n,t,e,r){if(!n)return e;var u=3>arguments.length;t=et(t,r,4);var o=-1,a=n.length;if(typeof a=="number")for(u&&(e=n[++o]);++o<a;)e=t(e,n[o],o,n);else y(n,function(n,r,o){e=u?(u=!1,n):t(e,n,r,o)});return e}function Dt(n,t,e,r){var u=3>arguments.length;return t=et(t,r,4),Nt(n,function(n,r,o){e=u?(u=!1,n):t(e,n,r,o)
+}),e}function Bt(n){var t=-1,e=n?n.length:0,r=Xt(typeof e=="number"?e:0);return It(n,function(n){var e=Jt(++t);r[t]=r[e],r[e]=n}),r}function $t(n,t,e){var r;t=Y.createCallback(t,e,3),e=-1;var u=n?n.length:0;if(typeof u=="number")for(;++e<u&&!(r=t(n[e],e,n)););else y(n,function(n,e,u){return!(r=t(n,e,u))});return!!r}function Ft(e){var r=-1,u=pt(),a=e?e.length:0,i=rt(arguments,!0,!0,1),f=[],l=a>=b&&u===n;if(l){var c=o(i);c?(u=t,i=c):l=!1}for(;++r<a;)c=e[r],0>u(i,c)&&f.push(c);return l&&p(i),f}function Tt(n,t,e){var r=0,u=n?n.length:0;
+if(typeof t!="number"&&null!=t){var o=-1;for(t=Y.createCallback(t,e,3);++o<u&&t(n[o],o,n);)r++}else if(r=t,null==r||e)return n?n[0]:h;return s(n,0,Ae(Re(0,r),u))}function Wt(t,e,r){if(typeof r=="number"){var u=t?t.length:0;r=0>r?Re(0,u+r):r||0}else if(r)return r=zt(t,e),t[r]===e?r:-1;return n(t,e,r)}function qt(n,t,e){if(typeof t!="number"&&null!=t){var r=0,u=-1,o=n?n.length:0;for(t=Y.createCallback(t,e,3);++u<o&&t(n[u],u,n);)r++}else r=null==t||e?1:Re(0,t);return s(n,r)}function zt(n,t,e,r){var u=0,o=n?n.length:u;
+for(e=e?Y.createCallback(e,r,1):Gt,t=e(t);u<o;)r=u+o>>>1,e(n[r])<t?u=r+1:o=r;return u}function Pt(n,t,e,r){return typeof t!="boolean"&&null!=t&&(e=(r=e)&&r[t]===n?null:t,t=!1),null!=e&&(e=Y.createCallback(e,r,3)),at(n,t,e)}function Kt(){for(var n=1<arguments.length?arguments:arguments[0],t=-1,e=n?St(Rt(n,"length")):0,r=Xt(0>e?0:e);++t<e;)r[t]=Rt(n,t);return r}function Lt(n,t){for(var e=-1,r=n?n.length:0,u={};++e<r;){var o=n[e];t?u[o]=t[e]:o&&(u[o[0]]=o[1])}return u}function Mt(n,t){return 2<arguments.length?ft(n,17,$e.call(arguments,2),null,t):ft(n,1,null,null,t)
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 35cafb518..f00b3da76 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -385,8 +385,8 @@
     if (typeof func != 'function') {
       return identity;
     }
-    // exit early if there is no `thisArg`
-    if (typeof thisArg == 'undefined') {
+    // exit early for no `thisArg` or already bound by `Function#bind`
+    if (typeof thisArg == 'undefined' || !('prototype' in func)) {
       return func;
     }
     switch (argCount) {
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 54be96117..9b3256165 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -3,7 +3,7 @@
  * Lo-Dash 2.2.1 (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,r,t){t=(t||0)-1;for(var e=n?n.length:0;++t<e;)if(n[t]===r)return t;return-1}function r(n,r){var t=n.m,e=r.m;if(t!==e){if(t>e||typeof t=="undefined")return 1;if(t<e||typeof e=="undefined")return-1}return n.n-r.n}function t(n){return"\\"+vr[n]}function e(){}function u(n){return n instanceof u?n:new o(n)}function o(n,r){this.__chain__=!!r,this.__wrapped__=n}function i(n,r,t){if(typeof n!="function")return Q;if(typeof r=="undefined")return n;switch(t){case 1:return function(t){return n.call(r,t)
+;(function(){function n(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 r(n,r){var t=n.m,e=r.m;if(t!==e){if(t>e||typeof t=="undefined")return 1;if(t<e||typeof e=="undefined")return-1}return n.n-r.n}function t(n){return"\\"+vr[n]}function e(){}function u(n){return n instanceof u?n:new o(n)}function o(n,r){this.__chain__=!!r,this.__wrapped__=n}function i(n,r,t){if(typeof n!="function")return Q;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)};case 3:return function(t,e,u){return n.call(r,t,e,u)};case 4:return function(t,e,u,o){return n.call(r,t,e,u,o)}}return J(n,r)}function f(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"&&(Vr(i)||y(i))){r||(i=f(i,r,t));var a=-1,l=i.length,c=o.length;for(o.length+=l;++a<l;)o[c++]=i[a]}else t||o.push(i)}return o}function a(n,r,t,e){if(n===r)return 0!==n||1/n==1/r;if(n===n&&!(n&&hr[typeof n]||r&&hr[typeof r]))return!1;
 if(null==n||null==r)return n===r;var o=Br.call(n),i=Br.call(r);if(o!=i)return!1;switch(o){case fr:case ar:return+n==+r;case lr:return n!=+n?r!=+r:0==n?1/n==1/r:n==+r;case pr:case sr:return n==r+""}if(i=o==ir,!i){if(Ar.call(n,"__wrapped__")||r instanceof u)return a(n.__wrapped__||n,r.__wrapped__||r,t,e);if(o!=cr)return!1;var o=n.constructor,f=r.constructor;if(o!=f&&!(j(o)&&o instanceof o&&j(f)&&f instanceof f))return!1}for(t||(t=[]),e||(e=[]),o=t.length;o--;)if(t[o]==n)return e[o]==r;var l=!0,c=0;
 if(t.push(n),e.push(r),i){if(c=r.length,l=c==n.length)for(;c--&&(l=a(n[c],r[c],t,e)););return l}return Xr(r,function(r,u,o){return Ar.call(o,u)?(c++,!(l=Ar.call(n,u)&&a(n[u],r,t,e))&&rr):void 0}),l&&Xr(n,function(n,r,t){return Ar.call(t,r)?!(l=-1<--c)&&rr:void 0}),l}function l(n,r,t){for(var e=-1,u=v(),o=n?n.length:0,i=[],f=t?[]:i;++e<o;){var a=n[e],l=t?t(a,e,n):a;(r?!e||f[f.length-1]!==l:0>u(f,l))&&(t&&f.push(l),i.push(a))}return i}function c(n){return function(r,t,e){var u={};t=K(t,e,3),e=-1;var o=r?r.length:0;
diff --git a/lodash.js b/lodash.js
index 94bd6447c..f62561ee3 100644
--- a/lodash.js
+++ b/lodash.js
@@ -1106,24 +1106,30 @@
       if (typeof func != 'function') {
         return identity;
       }
-      // exit early if there is no `thisArg`
-      if (typeof thisArg == 'undefined') {
+      // exit early for no `thisArg` or already bound by `Function#bind`
+      if (typeof thisArg == 'undefined' || !('prototype' in func)) {
         return func;
       }
-      var bindData = func.__bindData__ || (support.funcNames && !func.name);
+      var bindData = func.__bindData__;
       if (typeof bindData == 'undefined') {
-        var source = reThis && fnToString.call(func);
-        if (!support.funcNames && source && !reFuncName.test(source)) {
-          bindData = true;
+        if (support.funcNames) {
+          bindData = !func.name;
         }
-        if (support.funcNames || !bindData) {
-          // checks if `func` references the `this` keyword and stores the result
-          bindData = !support.funcDecomp || reThis.test(source);
-          setBindData(func, bindData);
+        bindData = bindData || !support.funcDecomp;
+        if (!bindData) {
+          var source = fnToString.call(func);
+          if (!support.funcNames) {
+            bindData = !reFuncName.test(source);
+          }
+          if (!bindData) {
+            // checks if `func` references the `this` keyword and stores the result
+            bindData = reThis.test(source);
+            setBindData(func, bindData);
+          }
         }
       }
       // exit early if there are no `this` references or `func` is bound
-      if (bindData !== true && (bindData && bindData[1] & 1)) {
+      if (bindData === false || (bindData !== true && bindData[1] & 1)) {
         return func;
       }
       switch (argCount) {
@@ -1544,7 +1550,7 @@
         isPartialRight = partialRightArgs = false;
       }
       var bindData = func && func.__bindData__;
-      if (bindData) {
+      if (typeof bindData == 'object') {
         if (isBind && !(bindData[1] & 1)) {
           bindData[4] = thisArg;
         }
diff --git a/test/test.js b/test/test.js
index 2574dcee1..1fe31f18a 100644
--- a/test/test.js
+++ b/test/test.js
@@ -625,7 +625,7 @@
           strictEqual(_.isEqual(object, clone), true);
 
           if (_.isObject(object)) {
-            notEqual(clone, object);
+            notStrictEqual(clone, object);
           } else {
             strictEqual(clone, object);
           }
@@ -640,7 +640,7 @@
 
       test('`_.' + methodName + '` should clone problem JScript properties (test in IE < 9)', 2, function() {
         deepEqual(func(shadowedObject), shadowedObject);
-        notEqual(func(shadowedObject), shadowedObject);
+        notStrictEqual(func(shadowedObject), shadowedObject);
       });
 
       test('`_.' + methodName + '` should pass the correct `callback` arguments', 1, function() {
@@ -809,6 +809,47 @@
       callback.apply(null, expected);
       deepEqual(args, expected);
     });
+
+    test('should return the passed function if already bound with `Function#bind`', 1, function() {
+      function a() {}
+
+      if (Function.prototype.bind) {
+        var bound = a.bind();
+        strictEqual(_.createCallback(bound, {}), bound);
+      }
+      else {
+        skipTest();
+      }
+    });
+
+    test('should return the passed function when there is no `this` reference', 2, function() {
+      function a() {}
+      function b() { return this.b; }
+
+      if (_.support.funcDecomp) {
+        strictEqual(_.createCallback(a, {}), a);
+        notStrictEqual(_.createCallback(b, {}), b);
+      }
+      else {
+        skipTest(2);
+      }
+    });
+
+    test('should only write `__bindData__` to named functions', 2, function() {
+      function a() {};
+      var b = function() {};
+
+      if (_.support.funcNames || _.support.funcDecomp) {
+        _.createCallback(a, {});
+        ok('__bindData__' in a)
+
+        _.createCallback(b, {});
+        ok(!('__bindData__' in b));
+      }
+      else {
+        skipTest(2);
+      }
+    });
   }());
 
   /*--------------------------------------------------------------------------*/
@@ -4272,7 +4313,7 @@
           result[key] = this[key];
         }, null, object);
 
-        notEqual(actual, object);
+        notStrictEqual(actual, object);
         deepEqual(actual, object);
       });
     });