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

[Drew Adams]

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

But why?  You're already looking at the doc, which
tells you which ones are optional.  What's gained?

Anyway, that's not what the OP use case was.  This
enhancement request is for someone saving a Lisp
command call to a file of _notes_.

  If I save this command then I delete the nils,
  because they are unnecessary there and make the
  expression noisy in my notes, so I delete them
  manually:
  (query-replace-regexp "a" "b")

Does that sound like a frequent or important need?

Seeing what `repeat-extended-command' is going to
reinvoke by default is important interactively.
Including for editing.  Better to show all of the
args, IMO.

The save-to-my-notes use case is not what the UI
of `repeat-extended-command' is, or should be,
designed for.

Just one opinion.