Glenn Morris <rgm@gnu.org> schrieb am Di., 19. Sep. 2017 um 02:41 Uhr:

>
> > I do agree that the calling convention of `file-name-base' is odd. How
> > about making the argument mandatory (initially only by changing the
> > advertised calling convention and the docstring)?
>
> Sounds good to me.
>

OK, here's a patch.