Re: [RFC PATCH] Per-window face support

[Daniel Colascione]

>> I think that ship sailed a long time ago. Almost everyone uses eq for
>> integers,
>
> That's OK.  We can (and probably should)
>
>     (defalias 'eq #'eql)
>
> without any significant performance impact.  Doing such a
>
>     #define EQ EQL
>
> in the C code might be too costly, which I why I suggest to do this
> bit-by-bit.

That's even worse, because now eq will mean different things depending on
whether a routine is implemented in C or Lisp, and Lisp would have no way
to do _real_ object identity comparisons. This isn't a problem we need to
solve so clumsily.