fix UTF-32 valid_encoding?
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix UTF-32 valid_encoding?
not use invalid codepoint. [ruby-core:79966] [Bug #13292]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57817 b2dd03c8-39d4-4d8f-98ff-823fe69b080e