Fix issue 1361 - Implement ES5 Array.prototype.toString.

src/array.js

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 363 matching lines @@
       }
     }
   }
 }
 
 
 // -------------------------------------------------------------------
 
 
 function ArrayToString() {
-  if (!IS_ARRAY(this)) {
-    throw new $TypeError('Array.prototype.toString is not generic');
+  var array;
+  var func;
+  if (IS_ARRAY(this)) {
+    func = this.join;
+    if (func === ArrayJoin) {
+      return Join(this, this.length, ',', ConvertToString);
+    }
+    array = this;
+  } else {
+    array = ToObject(this);
+    func = array.join;
   }
-  return Join(this, this.length, ',', ConvertToString);
+  if (!IS_SPEC_FUNCTION(func)) {
+    return %_CallFunction(array, ObjectToString);
+  }
+  return %_CallFunction(array, func);
 }
 
 
 function ArrayToLocaleString() {
   if (!IS_ARRAY(this)) {
     throw new $TypeError('Array.prototype.toString is not generic');
   }
   return Join(this, this.length, ',', ConvertToLocaleString);
 }
 
@@ skipping 974 matching lines @@
   // exposed to user code.
   // Adding only the functions that are actually used.
   SetUpLockedPrototype(InternalArray, $Array(), $Array(
     "join", getFunction("join", ArrayJoin),
     "pop", getFunction("pop", ArrayPop),
     "push", getFunction("push", ArrayPush)
   ));
 }
 
 SetUpArray();