diff --git a/build.js b/build.js
index b66559f63..fbbced105 100755
--- a/build.js
+++ b/build.js
@@ -1916,6 +1916,7 @@
         if (isMobile) {
           source = replaceSupportProp(source, 'enumPrototypes', 'true');
           source = replaceSupportProp(source, 'nonEnumArgs', 'true');
+          source = removeIsArrayFallback(source);
         }
         else {
           source = removeIsFunctionFallback(source);
@@ -1938,7 +1939,6 @@
         source = removeSupportNodeClass(source);
 
         if (!isMobile) {
-          source = removeIsArrayFallback(source);
           source = removeSupportEnumPrototypes(source);
           source = removeSupportNonEnumArgs(source);
 
@@ -2187,13 +2187,6 @@
           '}'
         ].join('\n'));
 
-        // replace `_.isArray`
-        source = replaceFunction(source, 'isArray', [
-          'var isArray = nativeIsArray || function(value) {',
-          '  return toString.call(value) == arrayClass;',
-          '};'
-        ].join('\n'));
-
         // replace `_.isEmpty`
         source = replaceFunction(source, 'isEmpty', [
           'function isEmpty(value) {',
diff --git a/dist/lodash.compat.js b/dist/lodash.compat.js
index 9c5368f52..aea00d213 100644
--- a/dist/lodash.compat.js
+++ b/dist/lodash.compat.js
@@ -951,7 +951,7 @@
      * // => true
      */
     var isArray = nativeIsArray || function(value) {
-      return value && typeof value == 'object' && toString.call(value) == arrayClass;
+      return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
     };
 
     /**
@@ -1457,7 +1457,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? typeof value == 'object' && toString.call(value) == dateClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
     }
 
     /**
@@ -1911,7 +1911,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? typeof value == 'object' && toString.call(value) == regexpClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
     }
 
     /**
diff --git a/dist/lodash.compat.min.js b/dist/lodash.compat.min.js
index 95135b138..5164e89d7 100644
--- a/dist/lodash.compat.min.js
+++ b/dist/lodash.compat.min.js
@@ -24,7 +24,7 @@ t?u[a]=t[e]:u[a[0]]=a[1]}return u}function kt(n,t){return se.fastBind||Zt&&2<arg
 var At=r.Array,It=r.Boolean,Pt=r.Date,Nt=r.Function,$t=r.Math,qt=r.Number,Bt=r.Object,Ft=r.RegExp,Rt=r.String,Tt=r.TypeError,Dt=At(),zt=Bt(),Lt=r._,Kt=Ft("^"+Rt(zt.valueOf).replace(/[.*+?^${}()|[\]\\]/g,"\\$&").replace(/valueOf|for [^\]]+/g,".+?")+"$"),Mt=$t.ceil,Ut=r.clearTimeout,Vt=Dt.concat,Gt=$t.floor,Ht=Kt.test(Ht=Bt.getPrototypeOf)&&Ht,Jt=zt.hasOwnProperty,Qt=Dt.push,Wt=r.setImmediate,Xt=r.setTimeout,Yt=zt.toString,Zt=Kt.test(Zt=Yt.bind)&&Zt,ne=Kt.test(ne=At.isArray)&&ne,te=r.isFinite,ee=r.isNaN,re=Kt.test(re=Bt.keys)&&re,ue=$t.max,ae=$t.min,oe=r.parseInt,ie=$t.random,fe=Dt.slice,le=Kt.test(r.attachEvent),ce=Zt&&!/\n|true/.test(Zt+le),pe={};
 pe[k]=At,pe[x]=It,pe[O]=Pt,pe[A]=Bt,pe[S]=qt,pe[I]=Ft,pe[P]=Rt;var se=a.support={};(function(){var n=function(){this.x=1},t={0:1,length:1},e=[];n.prototype={valueOf:1,y:1};for(var r in new n)e.push(r);for(r in arguments);se.argsObject=arguments.constructor==Bt&&!(arguments instanceof At),se.argsClass=Q(arguments),se.enumPrototypes=n.propertyIsEnumerable("prototype"),se.fastBind=Zt&&!ce,se.ownLast="x"!=e[0],se.nonEnumArgs=0!=r,se.nonEnumShadows=!/valueOf/.test(e),se.spliceObjects=(Dt.splice.call(t,0,1),!t[0]),se.unindexedChars="xx"!="x"[0]+Bt("x")[0];
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+U.prototype=a.prototype,se.argsClass||(Q=function(n){return n?Jt.call(n,"callee"):!1});var he=ne||function(n){return n?typeof n=="object"&&Yt.call(n)==k:!1},me=z({a:"q",e:"[]",h:"if(!(r[typeof q]))return u",f:"u.push(i)",b:!1}),de=re?function(n){return tt(n)?se.enumPrototypes&&typeof n=="function"||se.nonEnumArgs&&n.length&&Q(n)?me(n):re(n):[]}:me,be=z(ge),_e={"&":"&amp;","<":"&lt;",">":"&gt;",'"':"&quot;","'":"&#39;"},we=Y(_e),Ce=z(ve,{h:ve.h.replace(";",";if(c>3&&typeof a[c-2]=='function'){var d=p.createCallback(a[--c-1],a[c--],2);}else if(c>2&&typeof a[c-1]=='function'){d=a[--c];}"),f:"u[i]=d?d(u[i],m[i]):m[i]"}),je=z(ve),ke=z(ge,ye,{i:!1}),xe=z(ge,ye);
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 return t[0]}},a.countBy=function(n,t,e){var r={};return t=a.createCallback(t,e),ct(n,function(n,e,u){e=Rt(t(n,e,u)),Jt.call(r,e)?r[e]++:r[e]=1}),r},a.createCallback=function(n,t,e){if(null==n)return Ot;var r=typeof n;if("function"!=r){if("object"!=r)return function(t){return t[n]};var u=de(n);return function(t){for(var e=u.length,r=!1;e--&&(r=Z(t[u[e]],n[u[e]],i)););return r}}return typeof t!="undefined"?1===e?function(e){return n.call(t,e)}:2===e?function(e,r){return n.call(t,e,r)}:4===e?function(e,r,u,a){return n.call(t,e,r,u,a)
diff --git a/dist/lodash.js b/dist/lodash.js
index c23f95e48..e365e369c 100644
--- a/dist/lodash.js
+++ b/dist/lodash.js
@@ -634,7 +634,9 @@
      * _.isArray([1, 2, 3]);
      * // => true
      */
-    var isArray = nativeIsArray;
+    var isArray = nativeIsArray || function(value) {
+      return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
+    };
 
     /**
      * A fallback implementation of `Object.keys` which produces an array of the
@@ -1197,7 +1199,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? typeof value == 'object' && toString.call(value) == dateClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
     }
 
     /**
@@ -1644,7 +1646,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? typeof value == 'object' && toString.call(value) == regexpClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
     }
 
     /**
diff --git a/dist/lodash.min.js b/dist/lodash.min.js
index 727945e9a..59edcc2a7 100644
--- a/dist/lodash.min.js
+++ b/dist/lodash.min.js
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diff --git a/dist/lodash.underscore.js b/dist/lodash.underscore.js
index 1e3d0d096..db186cd13 100644
--- a/dist/lodash.underscore.js
+++ b/dist/lodash.underscore.js
@@ -500,7 +500,7 @@
    * // => true
    */
   var isArray = nativeIsArray || function(value) {
-    return toString.call(value) == arrayClass;
+    return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
   };
 
   /**
@@ -871,7 +871,7 @@
    * // => true
    */
   function isDate(value) {
-    return value ? typeof value == 'object' && toString.call(value) == dateClass : false;
+    return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
   }
 
   /**
@@ -1230,7 +1230,7 @@
    * // => true
    */
   function isRegExp(value) {
-    return value ? typeof value == 'object' && toString.call(value) == regexpClass : false;
+    return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
   }
 
   /**
diff --git a/dist/lodash.underscore.min.js b/dist/lodash.underscore.min.js
index 013b86b23..ca22d9979 100644
--- a/dist/lodash.underscore.min.js
+++ b/dist/lodash.underscore.min.js
@@ -17,8 +17,8 @@ t=P(t,r),r=-1;var u=n?n.length:0;if(typeof u=="number")for(;++r<u&&!(e=t(n[r],r,
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diff --git a/lodash.js b/lodash.js
index 8308b86c7..13814a6af 100644
--- a/lodash.js
+++ b/lodash.js
@@ -960,7 +960,7 @@
      * // => true
      */
     var isArray = nativeIsArray || function(value) {
-      return value && typeof value == 'object' && toString.call(value) == arrayClass;
+      return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false;
     };
 
     /**
@@ -1467,7 +1467,7 @@
      * // => true
      */
     function isDate(value) {
-      return value ? typeof value == 'object' && toString.call(value) == dateClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false;
     }
 
     /**
@@ -1921,7 +1921,7 @@
      * // => true
      */
     function isRegExp(value) {
-      return value ? typeof value == 'object' && toString.call(value) == regexpClass : false;
+      return value ? (typeof value == 'object' && toString.call(value) == regexpClass) : false;
     }
 
     /**