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

[Lars Ingebrigtsen]

Michael Heerdegen <michael_heerdegen@web.de> writes:

> `cl-defun's?

I've always assumed that those were really &rest, but I haven't actually
checked.

> Also advises have access to the actually passed parameter
> list.  Dunno if there are other cases.

Those are also detectable (and are probably &rest under the hood, I
guess?).

The proposal is to only peel the nils of the end if they are indeed
&optional.

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