Glyphs specific features and UFO format

Hi everyone.
Is there some list with all the Glyphs functions that can’t be stored on a ufo file besides the multi master info, bracket tricks, etc.?

Thanks in advance.

Smart Components, Cap- and Corner Components, Metrics Keys, …
Maybe (just guessing here) some of the glyph attributes [Script, (sub-) Category, Production Name]?
Also maybe: PS Hints. Definitely not: TT HInts.
And probably way more. You lose a lot of nice things in UFO ¯_(ツ)_/¯

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Was just typing and you beat me.

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Too much trouble with UFO, hence my fast response :smiley:

Thank you both.