[HarfBuzz] where is the documentation

[Kelvin Ma]

can someone please explain what each of the functions & their arguments at
https://lazka.github.io/pgi-docs/HarfBuzz-0.0/functions.html actually do?

Particularly font_get_glyph() and font_get_glyph_advance_for_direction().

no shade but how does anyone actually manage to use this library in their
projects if barely 5% of it is documented at all
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