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driver has the same settings as the profile that's being used.  Those
settings might include curves, floating point options, integer
options, and strings.  Those curves could include linearization
curves, light/dark transfer curves, auxiliary ink (e. g. Epson R800)
curves, and so forth.

I don't care about where we get them from, as long as there's a
reliable way to get them.  From my perspective, the most obvious way
is a serialized Gutenprint settings object, which is an XML document
that could just as well be embedded in a profile.  But the exact
mechanism doesn't matter, as long as it can carry enough data.