Changed Object.keys to return strings for element indices.

src/factory.h

 // Copyright 2006-2008 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 268 matching lines @@
                                                      Handle<JSObject> prototype,
                                                      Handle<Code> code,
                                                      bool force_initial_map);
 
   static Handle<DescriptorArray> CopyAppendProxyDescriptor(
       Handle<DescriptorArray> array,
       Handle<String> key,
       Handle<Object> value,
       PropertyAttributes attributes);
 
+  static Handle<String> NumberToString(Handle<Object> number);
+
   enum ApiInstanceType {
     JavaScriptObject,
     InnerGlobalObject,
     OuterGlobalObject
   };
 
   static Handle<JSFunction> CreateApiFunction(
       Handle<FunctionTemplateInfo> data,
       ApiInstanceType type = JavaScriptObject);
 
@@ skipping 76 matching lines @@
   // Update the map cache in the global context with (keys, map)
   static Handle<MapCache> AddToMapCache(Handle<Context> context,
                                         Handle<FixedArray> keys,
                                         Handle<Map> map);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FACTORY_H_