Re: Letter-case conversions in network protocols

[Stefan Monnier <monnier@iro.umontreal.ca>]

> The general problem that I'd like us to discuss is how to deal with
> letter-case conversions in code that deals with protocols, such as
> network-related protocols, that need to recognize certain keywords.
[...]
> Are there better solutions?  Ideas are welcome.

FWIW, I think the sanest way to solve this problem is to make sure
localization doesn't affect the case-mapping of ASCII chars.

I have no idea how "unacceptable" that is for someone using a locale
such as Turkish, tho.

To do better, we could add a separate nonascii case table and those
places in the code that manipulate "text" would then have to use

    (with-case-table nonascii-case-table ...)

This said, another approach is to improve our handling of case-fold: instead
of applying `downcase` on both sides and checking that it gives the same
result, we should be using a "normalization" function which will return
"the representative" of a given equivalence class.  E.g. in a Turkish
locale, `i`, `I`, and `ı`, ` should all belong to the same equivalence
class and this normalization function should hence return the same value
for all three.


        Stefan