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diff --git a/ChangeLog b/ChangeLog
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+Fri Jan 14 14:01:12 2011  NARUSE, Yui  <naruse@ruby-lang.org>
+
+	* pack.c (pack_unpack): the resulted string of unpack('M') must have
+	  ASCII-8BIT encoding (and ENC_CODERANGE_VALID). [ruby-core:34482]
+
 Fri Jan 14 13:38:58 2011  NARUSE, Yui  <naruse@ruby-lang.org>
 
 	* ext/zlib/zlib.c (gzfile_check_footer): ISIZE (Input SIZE) in