[XeTeX] Uppercase in Armenian

[Joseph Wright]

On 01/05/2022 13:10, Jonathan Kew wrote:
> Hi Zdeněk,
> 
> Checking the Unicode character database[1], U+0587 is listed as having a 
> *compatibility* decomposition to <0565,0582> (not 0587):
> 
> 0587;ARMENIAN SMALL LIGATURE ECH YIWN;Ll;0;L;<compat> 0565 0582;;;;N;;;;;
> 
> Likewise, the SpecialCasing.txt file[2] that defines case mappings other 
> than simple 1:1 substitutions shows the same decomposition for the 
> uppercase form:
> 
> 0587; 0587; 0535 0582; 0535 0552; # ARMENIAN SMALL LIGATURE ECH YIWN
> 
> So if I understand correctly, what \text_uppercase:n is doing is simply 
> implementing what the Unicode standard defines.
> 
> If this isn't the appropriate behavior, at least for some locales, I 
> believe that will need custom programming at some level, but I don't 
> know enough about it to get into any details.

Indeed: we will add support for alternative casing for Arminian to 
\text_uppercase:nn shortly.

Joseph