[tex-live] Font features linked with fontspec-preparse-external apparently broken in fontspec

[Karl Berry]

    when different versions of the same font are provided by the system and
    TeX Live, the one that will be used is rather arbitrary.

That must be avoided at all costs.  As you know, we just went through a
multi-year hassle of getting rid of such clashes/confusions.  (At least
I think they are gone now.)

I don't see a (serious) problem with the status quo.

best,
karl