I checked the \catcode of ^^^^200d, it is 12.
As for \XeTeXcharclass and \XeTeXinterchartoks they are used in bidi.sty but
not for 200d
I have found other pattern files where 200d is used, for example in Assamese:
\patterns{
% GENERAL RULE
% Do not break either side of ZERO-WIDTH JOINER (U+200D)
22
% Break on both sides of ZERO-WIDTH NON JOINER (U+200C)
11
% Break before or after any independent vowel.
অ1
> Le 25 mars 2021 à 13:26, Zdenek Wagner <[email protected]> a écrit :
>
> I do not see how polyglossia could do it, maybe it can change its
> \catcode and you could display the value. It might use it in
> XeTeEcharclass and XeTeXinterchartoks but I am not sure whether these
> can be displayed by \showthe
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