On Thu, Mar 7, 2019 at 3:33 PM John Cowan <xxxxxx@ccil.org> wrote:

While certainly the ideal this is not quite true in practice: we
do apply editorial errata silently, and the occasional substantive
erratum as a post-finalization note (see SRFI 113 e.g.)

Still, that's okay since it happens rarely, and even more rarely affects the type signatures. I have a checklist for handling errata, and I would just add that step to my checklist.

In addition, when would this editing be done? When the SRFI
is finalized?

That's the thinking, although there's nothing prohibiting an author from doing it before then. But if we do on behalf of the author, it would happen after finalization. The rule would be that it couldn't change the content of the document — only the markup.