[lucida] Best header definitions?

[Karl Berry]

The OpenType fonts don't have all the variations of the Type 1 Lucida,
let alone everything defined by Unicode.  I don't remember ever
discussing variant g's or upright math.  Maybe I'm just forgetting.

All the currently provided OT features are described in lucidaot.tex.
unicode-math's RawFeature can be used to turn them on and off.  That is
what I do for that documentation itself.  I am committed to never
changing those ss numbers, and something as basic as RawFeature is not
going to change in unicode-math, either.  So there's no problem with
that approach.

I've resisted providing a .sty for OT Lucida precisely because of
fontspec/unicode-math variations over the years, as Bruno mentions, and
also because different users want different things.  For example,
there's nothing magic about Scale=.92.

Being a long-time TeX user who wants reproducible runs, I also greatly
dislike using system font lookups and don't much want to recommend them
-- but I know that in practice they work better for some people.
Unfortunately, XeTeX/fontspec effectively treated filename lookups as
second-class citizens for many years.  This is where the .fontspec files
come in.

Anyway, if people think it would be useful, in addition to the
lucidaot.tex source, I don't mind providing Shay's .sty, or whatever
variation(s), on the web site.  As long as it was understood that it's
not feasible to make them work for all possible installations.

Best,
Karl