> > GHC 6.2 (shortly to be released) also supports toUpper, toLower, and
> the
> > character predicates isUpper, isLower etc. on the full Unicode
> character
> > set.
> >
> > There is one caveat: the implementation is based on the C library's
> > towupper() and so on, so the support is only as good as the
> C library
> > provides, and it relies on wchar_t being equivalent to Unicode (the
> > sensible choice, but not all libcs do this).
>
> Now, why would one want to base this on C's wchar_t and its
> "w" routines?
Because it's easy, and it's still an improvement over what we had
before.
> wchar_t is sometimes (isolated) UTF-32 code units,
> including in Linux, sometimes it is (isolated) UTF-16 code units,
> including in Windows, and sometimes something utterly useless.
Yes, I mentioned this above.
> Please instead use ICU's UChar32,
Thanks, I didn't know about ICU - it looks nice. I did briefly
investigate libunicode, which turned out to be worse than the C library.
Cheers,
Simon
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