Mark]
> I *think* range uses long internally

Aargh!  Sorry, Eric.  I take it back.  *xrange* uses longs internally
(and used to use ints once upon a time, IIRC), but there's a weird mix
of int and long in builtin_range that doesn't make any sense to me.  I
suspect it's historical, and may have to do both with the xrange
int->long switch and the int -> Py_ssize_t switch.