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+Mon Jul 29 16:34:29 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* hash.c (rb_hash_initialize_copy): clear old table before copy new
+	  table.
+
 Mon Jul 29 16:34:09 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (rb_hash_assoc): aggregate object can be initialized only