git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30262 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merges r29868 and r29872 from trunk into ruby_1_9_2.¶
copy if encoding conversion is needed. [ruby-core:33283]
--
encoding and different encoding string. [ruby-core:33283]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_2@30262 b2dd03c8-39d4-4d8f-98ff-823fe69b080e