In article <6.0.0.20.2.20080916184943.08a281f0 / localhost>,
  Martin Duerst <duerst / it.aoyama.ac.jp> writes:

>>> So ruby should treat it as a character.
>
> I don't think #each_character should do that, although
> its name may suggest so. What may happen (maybe for Ruby 2.0)
> is that we have a parameter to #each_character which, if present,
> leads to lumping the above two characters together.

Unless doing that, single character in JIS X 0213 is mapped
to two characters in Unicode.

It is not desired result.
-- 
Tanaka Akira