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+Mon Jul 29 21:53:41 2013  Masaki Matsushita  <glass.saga@gmail.com>
+
+	* hash.c (rb_hash_compare_by_id): don't call rb_hash_rehash()
+	  if self.compare_by_identity? == true.
+
 Mon Jul 29 21:29:48 2013  Masaki Matsushita  <glass.saga@gmail.com>
 
 	* hash.c (rb_hash_assoc): performance improvement by replacing