> I think it would be more surprising if by default it did something
> different than what the 'which' command does.

You know, I've never noticed that Unix `which` automatically
abspathified the results (does it always? is it system-dependent? how
about Windows?).

> It also seems like the If there's demand for a non-abspath version we
> could add that as a feature later.

That sounds overkill. If which() calls abspath, then there's no way to
get a non-absolute result. While if which() doesn't call abspath, the
caller is free to call abspath() if they want to ensure the result is
absolute.

Sounds like a no-brainer to me :-)