Stefan Monnier <monnier@iro.umontreal.ca> writes:

> - Replace `&optional arg` with `&rest args` and pass those args via
>   `apply`, so the number of args passed doesn't depend on the function
>   but on the caller.

I like this idea. See patch.

> - Always pass both args to the function (i.e. as documented in the
>   docstring).

This isn't backwards compatible, is it?

Joseph