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+Tue Oct 12 15:36:09 2010  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* io.c (rb_io_ungetc): use unsigned int for GB18030.
+
 Tue Oct 12 15:14:21 2010  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* io.c (rb_io_putc): support multibyte characters.