Ruby

rational.c: canonicalization case

• rational.c (float_numerator, float_denominator): fix for
  canonicalization case where Float#to_r could return an Integer
  not a Rational. although mathn.rb has been removed in the
  trunk, fix for the backport purpose.
  [ruby-core:80942] [Bug #13528]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58523 b2dd03c8-39d4-4d8f-98ff-823fe69b080e