Shiro Kawai scripsit:

> Hmm, certainly iterating -next/prev works (and in naive multibyte strings
> you have to do it anyway---but implementation may choose better string
> representation), but I concern the overhead of range check per iteration.

Okay, that's convincing.  I still want to think about error vs. #f, though.

--
John Cowan          http://www.ccil.org/~cowan        xxxxxx@ccil.org
Fundamental thinking is ha-ard.  Let's go ideology-shopping.
                        --Philosopher Barbie