Eli Zaretskii <eliz@gnu.org> writes:

> So what is the problem with using unibyte-string for producing a
> unibyte string from a list of bytes?  It sounds like it's exactly
> what is needed here, and is actually used in some places in socks.el.

Great, thanks. That's what was needed indeed. I've updated things
accordingly and have added a doc string to socks-send-command explaining
the address parameter.