bug#45333: complex command history should not save optional nil parameters

[Lars Ingebrigtsen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> (advice-add 'test :around (defun test-ad (f &rest args) args))
> #+end_src
>
> the signature of `test' is still `(test &optional X)` as reported by C-h
> f although the function is able to distinguish a specified nil from a
> not specified optional argument.

`C-h f' lies, of course.  :-)  That is, `help-function-arglist'.  (Which
reminds me -- I've always found it odd that that function lives in
help.el, and is in Emacs Lisp instead of C.  It is, after all, used by
eldoc etc, and it'd probably be nice if it were more efficient.)

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no