Convert serialized values to ints if they are whole and less than 53 bits.

Source/bindings/v8/V8Binding.h

 /*
 * Copyright (C) 2009 Google Inc. All rights reserved.
 * Copyright (C) 2012 Ericsson AB. 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.
@@ skipping 25 matching lines @@
 #include "bindings/v8/V8BindingMacros.h"
 #include "bindings/v8/V8PerIsolateData.h"
 #include "bindings/v8/V8StringResource.h"
 #include "bindings/v8/V8ThrowException.h"
 #include "bindings/v8/V8ValueCache.h"
 #include "wtf/MathExtras.h"
 #include "wtf/text/AtomicString.h"
 #include <v8.h>
 
 namespace WebCore {
+    const int64_t kJSMaxInteger = 0x20000000000000LL - 1; // 2^53 - 1, maximum integer exactly representable in ECMAScript.
 
     class DOMStringList;
     class DOMWindow;
     class Document;
     class Frame;
     class NodeFilter;
     class ScriptExecutionContext;
     class ScriptWrappable;
     class XPathNSResolver;
 
@@ skipping 573 matching lines @@
     inline v8::Local<v8::Function> createClosure(v8::FunctionCallback function, v8::Handle<v8::Value> environment)
     {
         return v8::FunctionTemplate::New(function, environment)->GetFunction();
     }
 
     v8::Local<v8::Value> getHiddenValueFromMainWorldWrapper(v8::Isolate*, ScriptWrappable*, v8::Handle<v8::String> key);
 
 } // namespace WebCore
 
 #endif // V8Binding_h