Amirouche raised the idea of an exact-integer -> enum-set conversion
(which he called "enum-set-unfold", a rather confusing name) in
https://srfi-email.schemers.org/srfi-209/msg/15202515/, but the
thread dropped after a short discussion.  Is this idea worth
revisiting?  The bitmap representation of enum-sets used by the sample
implementation means that this could be handled very efficiently,
which is a point in its favor.

Marc also requested syntax-case versions of define-enum, which I
will try to add to the sample implementation soon.

Is there anything else that still needs to be addressed?

--
Wolfgang Corcoran-Mathe  <xxxxxx@sigwinch.xyz>

"Not all programming languages have a way to write definitions, but
most do.  Those that do not are for wimps." --The Great Quux