Ruby

• ext/bigdecimal/lib/bigdecimal/util.rb (BigDecimal#to_d): added
  for adapting other Numeric subclasses. [ruby-dev:44245]
• test/bigdecimal/test_bigdecimal_util.rb: test for the above change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32676 b2dd03c8-39d4-4d8f-98ff-823fe69b080e