ActiveSupport::Multibyte handlers

I'm currently working on improving the ActiveSupport::Multibyte implementation and I was wondering which features are actually used. So please respond to this email or email me personally if you've done either of the following:

1) Directly used the chars accessor on strings. (ie. "おはよ".chars.reverse)
2) Written a handler to support an encoding other than UTF-8 (ActiveSupport::Multibyte::Chars.handler = MyShiftJISHandler)

Thanks in advance,
  Manfred