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+Tue Oct 12 18:25:04 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* string.c (rb_str_concat): use unsigned int for GB18030.
+
 Tue Oct 12 17:53:49 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* numeric (check_uint): the mask must refer to VALUE.