A posix/utf8 combination that wouldn't break anything is perfect.
Furthermore if Debian already did it.
On Mar 1, 2012 12:15 PM, "Chí-Thanh Christopher Nguyễn" <chithanh@gentoo.org>
wrote:

> Ulrich Mueller schrieb:
> >
> > If we change the default, we should use a less intrusive approach
> > and change LC_CTYPE only, which is the relevant variable that
> > controls the character encoding functions.
>
> LC_CTYPE will affect transliteration too. Introducing a C.UTF-8 (or
> POSIX.UTF-8) locale like Debian did could be done without possibly
> subjecting users to unexpected transliteration results of e.g.
> Cyrillic or German umlauts.
>
>
> Best regards,
> Chí-Thanh Christopher Nguyễn
>
>
>
>