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Serbian Cyrillic in Vollkorn Regular
feature locl {
script cyrl;
language SRB exclude_dflt;
sub uni0431 by uni0431.loclSRB;
} locl;
Serbian Cyrillic in Vollkorn Italic
feature locl {
script cyrl;
language SRB exclude_dflt;
sub [uni0431 uni0433 uni0434 uni043F] by [uni0431.loclSRB uni0433.loclSRB uni0434.loclSRB uni043F.loclSRB];
sub uni0442 by uni0442.loclSRB;
} locl;
Important
As only few applications are able to manage Serbian localisation in OpenType fonts it is a good idea to double the localisation through Style Set feature in OpenType.
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On Glyphs Forum you could find interesting discussion about Sebian Cyrillic Script. And very important notice by Alexei Vanyashin for the difference between Serbian and Macedonian Cyrillic Script. Look here for more: https://forum.glyphsapp.com/t/since-indesign-doesnt-have-serbian-and-macedonian-languages/824