In article <6.0.0.20.2.20071231200106.0b1bfb00 / localhost>,
  Martin Duerst <duerst / it.aoyama.ac.jp> writes:

> I'm not sure this was a good idea. It will change Ruby behavior
> in various areas, even when not intended.

Do you have concreate examples now?

Some application require this clearly, such as curses.
Some aplication may have trouble with this.

I'd like to know Ruby 1.9.0-0 causes trouble or not.

However I guess it is not so harmful.  It is because
libreadline invokes setlocale.  So readline-enabled irb
invokes setlocale.  But I don't see locale related trouble
on irb.
-- 
Tanaka Akira