* numeric.c (num_quo): should return a Float for a Float argument.
  [ruby-dev:44710] [Bug #5515]

* test/ruby/test_fixnum.rb: Add an assertion for the above change.

* test/ruby/test_bignum.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@41099 b2dd03c8-39d4-4d8f-98ff-823fe69b080e