Hello,

I'm trying to decrypt the LuaTeX reference manual. I find it easy
enough to read data about different fonts when using
   fontA = fontloader.open('a.otf')
and then
   glyphs = fontloader.to_table(fontA).glyphs
but I'm not able to figure out how to aks the same question about the
font that is currently being used (in MKIV).

I would like to know if a glyph with some Unicode value is present in
the font or not.

Thanks for the hints,
    Mojca
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