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+Tue Dec  3 23:06:20 2013  Narihiro Nakamura  <authornari@gmail.com>
+
+	* object.c (rb_obj_clone): don't copy FL_WB_PROTECTED of a
+	  original object.
+
 Tue Dec  3 22:32:18 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* hash.c (rb_hash_recursive): make similar (recursive) constructs