Expose SameValue equality comparison algorithm

include/v8.h

 // Copyright 2012 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 1461 matching lines @@
 
   bool BooleanValue() const;
   double NumberValue() const;
   int64_t IntegerValue() const;
   uint32_t Uint32Value() const;
   int32_t Int32Value() const;
 
   /** JS == */
   bool Equals(Handle<Value> that) const;
   bool StrictEquals(Handle<Value> that) const;
+  bool SameValue(Handle<Value> that) const;
 
   template <class T> V8_INLINE static Value* Cast(T* value);
 
  private:
   V8_INLINE bool QuickIsUndefined() const;
   V8_INLINE bool QuickIsNull() const;
   V8_INLINE bool QuickIsString() const;
   bool FullIsUndefined() const;
   bool FullIsNull() const;
   bool FullIsString() const;
@@ skipping 4985 matching lines @@
  */
 
 
 }  // namespace v8
 
 
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_