Hi Mathieu,

On Fri, 04 Dec 2020 09:12:13 +0100
Mathieu Othacehe <othacehe@gnu.org> wrote:

> I used "eq?" because if "system" is left to its default in some image
> definition, then we would end-up comparing "#f" and a string.

Yeah, but eq? only compares the "addresses" of things, not the content.

(eq? "a" "a") could totally be #f if one is unlucky.

For example try:

(eq? "a" (read))

and enter "a".  The result will be #f.

On the other hand, (equal? "a" "a") would work; also (equal? "a" #f) would
not fail.