Am 15.02.20 um 08:44 schrieb Eli Zaretskii:
>
> I'd like to install your patch, and I'd like to do it soon, so it
> makes it into Emacs 27.  Can you please propose a modified patch which
> adds some minimal information about what's going on to the doc string
> and/or the comments around the code?

Here is the revised patch. I have cleared the FIXME issue mentioned by Lars and added commentary to what is going on.