* bignum.c (rb_big_size): Return the bignum "bytewise" size.
  [ruby-core:55578] [Feature #8553]
  This is accepted by matz on DevelopersMeeting20130727Japan.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42204 b2dd03c8-39d4-4d8f-98ff-823fe69b080e