Re: [idn] I-D ACTION:draft-ietf-idn-uri-00.txt

["D. J. Bernstein" <djb@cr.yp.to>]

Adam M. Costello writes:
> There is a potential problem with host name comparisons.

All the problems you describe go away if nameprep is handled in the way
I've been suggesting: registries prohibit bad names, users have whatever
software is needed to type good names, and most programs are left alone.

> Software comparing IRIs presumably knows about case-equivalence among
> non-ASCII characters, but software comparing URIs might not. 

Good names never include uppercase non-ASCII characters. Comparisons of
non-ASCII characters are bitwise comparisons.

> That means IRIs might use mixed-case host names, but when they are
> converted to URIs the non-ASCII characters must be forced to lower
> case (in the host part only, not the path).

All that complexity disappears. Converting IRI to URI is a simple matter
of converting Unicode to UTF-8.

---Dan