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+Sun Jun  9 09:34:44 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (big2str_base_powerof2): New function.
+	  (rb_big2str0): Use big2str_base_powerof2 if base is 2, 4, 8, 16 or 32.
+
 Sun Jun  9 00:59:04 2013  Tanaka Akira  <akr@fsij.org>
 
 	* hash.c (rb_hash): Use rb_integer_pack to obtain least significant