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+Tue Aug 25 17:38:22 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* bignum.c (rb_big_clone, bigmul1_normal, bigdivrem): trivial
+	  optimization.
+
+	* bignum.c (big2dbl): truncates zero digits to get rid of possible
+	  underflow.
+
 Tue Aug 25 12:22:25 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* Makefile.in (enc/unicode/name2ctype.h): explicitly ignores the