Glyphs are generally defined as pure outlines (the "glyf" table [1]), and the instruction set is an optional system for things like grid fitting. Ligatures, ker

Glyphs are generally defined as pure outlines (the "glyf" table [1]), and the instruction set is an optional system for things like grid fitting. Ligatures, kerning etc. are normal tables. [1] https://developer.apple.com/fonts/TrueType-Reference-Manual/RM06/Chap6glyf.html https://developer.apple.com/fonts/TrueType-Reference-Manual/...