> It looks as though two strong Unicode encoding candidates for TeX/LaTeX are
> the UTF-8 and UTF-32. The UTF-32 encoding might be better to used
> internally for performance and programming convenience reasons. The UTF-8
> encoding is better to work with as an extension of ASCII. So one might make
> a TeX version that say uses UTF-32 internally, and UTF-8 and UTF-32
> externally.

ExTeX use internal UTF-32!