Gregor Zattler <grfz@gmx.de> writes:

> (customize-variable 'auto-save-file-name-transforms)
>
> shows the customization form for this variable accompanied
> by a doc string.
>
> According to the doc string the argument UNIQUIFY may have
> on of more than two values but the form only gives access to
> a toggle switch.

I'm unable to reproduce this -- with "emacs -Q" in Emacs 29, I get: