Dear List,

 Sorry if this isn't the right place to post this, but wasn't sure.
The following commands are used in some of the examples of Lua(La)TeX
on the net:

 fonts.handlers.otf.addfeature, fonts.protrusions.vectors,
fonts.expansions.classes, etc.

 I searched too much to find some kind of documentation about them but
I couldn't find anything

 Are there any documentation about these commands?

 Any help would be gratefully appreciated.


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