sortcar and sort-subr

[Stefan Monnier]

While adding a `predicate' argument to sort-subr, I noticed that
it uses a `sortcar' function (if fboundp) that I've never heard
of and that doesn't exist and seems never to have existed.

Any objection to removing it (and adding a `predicate' argument
for when your keys can't conveniently be numbers or strings) ?


        Stefan