bug#41727: 26.3; Doc of `define-minor-mode' and minor-mode commands

[Drew Adams]

> > AFAIU Drew wants to mention that even in the noninteractive case
> > `prefix-numeric-value' is called on the ARG before testing it.
> 
> If that's the essence of the bug report (and I indeed didn't realize
> that), then I don't think it's a good idea to document this quirk.  It
> looks like an implementation detail to me, if not an outright bug that
> should be fixed.

If you don't document it then users won't know how
to use it correctly from Lisp (at least not without
studying the code).

That's misleading enough to make me wonder whether,
in that case, it might be better to say nothing at
all about the call-from-Lisp case, forcing Lisp
users to consult the code.

My preference is (obviously) to have the doc tell
the whole story: accurate & complete.