On Tue, Sep 8, 2020 at 10:44 AM Dario Gjorgjevski <dario.gjorgjevski@gmail.com> wrote:
> I don't think so. Could you (re)state the use case where this matters?
> That helps prioritize it.

Hi João,

My use case is very simple: I have a directory which, among others,
contains files named 1, 2, etc.  It’s really annoying that C-x C-f 2 RET
does not find 2 but instead finds some other file containing 2 in its
name.

Is this is vanilla emacs, or are you using some icomplete-mode or fido-mode?
I.e. can you post the entire Emacs -Q recipe?
 
Also, I can’t start an R process by doing M-x R RET.  (You need to have
R and ESS installed for this, of course.)

Same question. If you're using, say, fido-mode, you can probably fix this by typing
M-j instead of RET in these one-letter completion cases. Or even C-u M-j, if that
doesn't work.

João