On 2/9/26 21:13, Arthur A. Gleckler wrote:
>
> On Mon, Feb 9, 2026 at 6:10 PM Bradley Lucier <xxxxxx@purdue.edu
> <mailto:xxxxxx@purdue.edu>> wrote:
>
>     Perhaps a simple, short fix is appropriate for the SRFI document.
>
>
> Would you characterize this as a true mistake, not just a broken
> design?  It's a bit too mind-bending for me, so I want to be sure.  If
> it's the former, we can issue an erratum.

The design is correct, it's just that the statement
===================
The vectors of upper and lower bounds of an interval can have zero
elements, in which case the zero-dimensional interval itself has no
elements ...
===================
is incorrect, the zero-dimensional interval has one element, namely
(values). That's why

 > (import (srfi 231))
 > (interval-volume (make-interval '#()))
1

Brad