> From: Philipp Stephani <p.stephani2@gmail.com>
> Date: Sat, 19 Mar 2016 16:34:55 +0000
> Cc: michael_heerdegen@web.de, emacs-devel@gnu.org
>
>  > (g 10 202 30) => error -> "Wrong number of arguments"
>  >
>  > This cannot be detected without evaluating the function.
>
>  Are we discussing the usefulness of the function, or are we discussing
>  how best to implement it?
>
>
> We are discussing for which cases it can be implemented. It can be implemented and would be useful for a
> wide range of functions, such as those defined with defun. It cannot be implemented for functions like g; that's
> just a limitation we have to live with.

That's one possibility.  Another is that the implementation will be
able to find out the truth, just like the Lisp interpreter does.