git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@42461 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
String#bytesize instead of String#length.
reported by shekhei (shek hei wong) at [ruby-core:53775]
[Backport #8176].
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@42461 b2dd03c8-39d4-4d8f-98ff-823fe69b080e