Ah, we did not pass the diffopt to the function builtin_diff() in
1.3.X series, so not really.
Ahh, ok. Never mind. It's not like people have been clamoring for it, it
just seemed to be such a _silly_ thing.
Might as well just go into the curren development tree, and then we'll
have it fixed eventually (1.4.0?)
Linus