RE: [External] : Re: master 927b885 1/3: Disable filtering of commands in M-x completion

[Drew Adams]

> > (defun foo (&optional beg end)
> >  (interactive "r")
> >  (message "FOO"))
> >
> > 1. `emacs -Q'
> > 2. Eval that defun.
> > 3. `M-x foo'
> >
> > Just works.
> > No mark set, no active region, no error.
> > What am I missing?
> 
> I have no idea.  Here it signals an error,
> in Emacs 26, 27, and 28.

OK, interesting.  Here it doesn't.
MS Windows 10
Emacs 23 through 27.1
emacs -Q

`mark-even-if-inactive' = t
(default in Emacs 23 and later)