Re: library for unicode collation in C for texi2any?

[Werner LEMBERG]

>> OK, no tailoring.  I wasn't aware of those differences, thanks for
>> pointing me to it.
>> 
>> Hopefully, we agree that `@documentlanguage` should set a
>> language-specific collation for the index.
> 
> Without tailoring, this basically means collation according to
> Unicode codepoints.

Uh oh, this is not good.  As an example, consider the letter 'ä'.
There are two possible collations that are considered as correct for
German:

* Sort 'ä' right before 'b'.

* Handle 'ä' similar to 'ae' but sort it after 'ae'.

Neither collation corresponds to Unicode codepoints.


    Werner