* ext/bigdecimal/bigdecimal.c (GetVpValueWithPrec):
  treat 0.0 and -0.0 of floating-point numbers specially for an optimization
  and to correctly propagate its signbit to the result.
  [Bug #9214] [ruby-core:58858]

* test/bigdecimal/test_bigdecimal.rb: add tests case for the above change.

* test/bigdecimal/test_bigdecimal_util.rb: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44021 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2013-12-06

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44022 b2dd03c8-39d4-4d8f-98ff-823fe69b080e