Ulrike and Hans wrote
> > It is not only that font. Actually the libertine package broke,
> > fontawesome broke, and Coelacanth was only used by Thérèse in the
> > example as it is free, her real problem was with using Goudy
> > fleurons.
> in context i strongly advice against using numbers instead of names
It's not just explicit numbers via \char, it's character data in
documents using specific fonts with documented PUA characters
Many fonts use this for assorted reasons
https://en.wikipedia.org/wiki/Private_Use_Areas#Vendor_use
notably SIL fonts using it for minority languages not in Unicode and
Microsoft for all kinds of CJK stuff.
Given how many reports are appearing in the few days that this has been
exposed to a larger number of uses via LaTeX, use of PUA characters
really isn't a rare occurrence at all.
If you need to allocate a block for internal use wouldn't it be possible
to use one of the high areas Supplementary Private Use Area-A or B
(U+F0000 - U+FFFFF) (U+100000 - U+10FFFF) ?
The BMP PUA block (U+E000 U+F8FF) just has so many documented uses in
existing fonts.
David
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