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

Source/bindings/v8/V8Binding.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009 Google Inc. 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
@@ skipping 155 matching lines @@
 
     return filter.release();
 }
 
 static const int8_t kMaxInt8 = 127;
 static const int8_t kMinInt8 = -128;
 static const uint8_t kMaxUInt8 = 255;
 const int32_t kMaxInt32 = 0x7fffffff;
 const int32_t kMinInt32 = -kMaxInt32 - 1;
 const uint32_t kMaxUInt32 = 0xffffffff;
-const int64_t kJSMaxInteger = 0x20000000000000LL - 1; // 2^53 - 1, maximum integer exactly representable in ECMAScript.
 
 static double enforceRange(double x, double minimum, double maximum, bool& ok)
 {
     if (std::isnan(x) || std::isinf(x)) {
         ok = false;
         return 0;
     }
     x = trunc(x);
     if (x < minimum || x > maximum) {
         ok = false;
@@ skipping 397 matching lines @@
     return DOMWrapperWorld::isolatedWorld(v8::Context::GetCurrent());
 }
 
 v8::Local<v8::Value> getHiddenValueFromMainWorldWrapper(v8::Isolate* isolate, ScriptWrappable* wrappable, v8::Handle<v8::String> key)
 {
     v8::Local<v8::Object> wrapper = wrappable->newLocalWrapper(isolate);
     return wrapper.IsEmpty() ? v8::Local<v8::Value>() : wrapper->GetHiddenValue(key);
 }
 
 } // namespace WebCore