Aleix Conchillo Flaqué schreef op do 23-06-2022 om 13:27 [-0700]:
> +     (put-string port (string-titlecase (symbol->string scheme)))

I'd add a little explanation in a comment (e.g.:

   ;; While according to RFC 7617 Schemes are case-insensitive:
   ;;
   ;; ‘Note that both scheme and parameter names are matched
   ;; case-insensitive’
   ;;
   ;; some software (*) incorrectly assumes title case for scheme
   ;; names, so use the more titlecase.
   ;;
   ;; (*): See, e.g.,
   ;; <https://[bug report 1]/>
   ;; <https://[bug report 2]/>

I think it's reasonable to do some changes in Guile to work-around
potential bugs in other software that Guile has no control over or even
knows about, at the same time Guile seems to be just following the
spec, the compatibility bug seems to be in the other software, so to
help the other software a bit, I think it would be best to report
things in the buggy software too.