Per Bothner scripsit:

> On implementations where cursor == index, should string-cursor? return
> #t or #f given an integer?  I assume #t.

I assume you mean a non-negative exact integer.  I can see a case for
allowing the implementation to return either #t or #f in such cases,
but probably returning #t is more useful.  So the function means "Can
obj be a string cursor?"

In particular, where indexes are non-negative character offsets and
cursors are non-positive byte offsets, then 0 is both an index and
a cursor, and #t is the most sensible value.

--
John Cowan          http://www.ccil.org/~cowan        xxxxxx@ccil.org
The first thing you learn in a lawin' family is that there ain't
no definite answers to anything.  --Calpurnia in To Kill A Mockingbird