* lib/yaml/rubytypes.rb: range of exponential floats. [ruby-core:02824] * test/yaml/test_yaml.rb: tests for strings start with colon and some round trip. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@6318 b2dd03c8-39d4-4d8f-98ff-823fe69b080e