* bignum.c (rb_big2ulong_pack): Use rb_integer_pack.
  (rb_big_aref): Call big2ulong with TRUE for "check" argument.
  It should be non-effective.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41621 b2dd03c8-39d4-4d8f-98ff-823fe69b080e