On 3/13/2020 3:56 PM, Marcel Fabian Krüger wrote:
That is good to know, could this be added to the documentation? Given that
the engine used bits are called "valid bits", I always assumed that the
remaining bits are reserved.
the protect run adds 255 so >=256 is protected (which in itself means
nothing, read: whatever meaning ones gives to it) (it sort of reflects
the "good old tex" distinction between a character and a glyph but we
only have glyphs) so values 0..255 are kind of free to use (but there
are some conventions about them identifying single shapes or ligature
shapes that one can then act upon)
Hans
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