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+Sun Aug 18 10:05:12 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (rb_big2str1): Make an expression more explicit.
+
 Sun Aug 18 03:18:45 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (rb_big2str1): Use power_level instead of bitsize(xn).