rails/rails — pull request #4335 by lest (2012-01-05 21:27:01+00:00)
Title: remove use of Multibyte.clean as it's no-op in ruby 1.9

It do nothing https://github.com/rails/rails/blob/39625d153781ffa07121c35dc4bba40410624c9c/activesupport/lib/active_support/multibyte/utils.rb#L20-25

And is going to be removed in https://github.com/rails/rails/pull/4332/files#diff-4