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+Mon Jun 10 12:10:06 2013  Tanaka Akira  <akr@fsij.org>
+
+	* bignum.c (integer_unpack_num_bdigits_small: Extracted from
+	  rb_integer_unpack.
+	  (integer_unpack_num_bdigits_generic): Ditto.
+	  (integer_unpack_num_bdigits_bytes): New function.
+	  (rb_integer_unpack): Use above functions.
+	  Return a Bignum for INTEGER_PACK_FORCE_BIGNUM evenwhen the result
+	  is zero.
+
 Mon Jun 10 05:38:23 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (absint_numwords_small): New function.