I’ve noticed that a fairly large number of non-Latin fonts contain feature tags of the form 'zz##', but these are not listed in the OpenType feature registry. I gather these have something to do with localization (based on cases I’ve analyzed), but I have no idea what causes these features to be activated. Can anyone point me to a source of information on what these features are used for?
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Is there a special technique to stip them from font, or any post I can study. I simply shipped font from VOLT and found no zz##, which was there before shipping.