Fix copy paste: IsUint32() checks if value is unsigned, not signed.

include/v8.h

 // Copyright 2007-2009 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 749 matching lines @@
    * Returns true if this value is external.
    */
   bool IsExternal() const;
 
   /**
    * Returns true if this value is a 32-bit signed integer.
    */
   bool IsInt32() const;
 
   /**
-   * Returns true if this value is a 32-bit signed integer.
+   * Returns true if this value is a 32-bit unsigned integer.
    */
   bool IsUint32() const;
 
   /**
    * Returns true if this value is a Date.
    */
   bool IsDate() const;
 
   Local<Boolean> ToBoolean() const;
   Local<Number> ToNumber() const;
@@ skipping 2625 matching lines @@
 
 }  // namespace v8
 
 
 #undef V8EXPORT
 #undef V8EXPORT_INLINE
 #undef TYPE_CHECK
 
 
 #endif  // V8_H_