bug#65055: 30.0.50; save-place-abbreviation-file-names :set fails for saveplace-pdf-view places

[Eli Zaretskii]

> From: Visuwesh <visuweshm@gmail.com>
> Date: Fri, 04 Aug 2023 21:45:04 +0530
> 
> saveplace-pdf-view package [1] uses a custom "place" format to save and
> restore the last position for PDF files viewed via doc-view package.
> 
> One such "place" is
> 
>     ("/home/viz/tmp/piron1976.pdf"
>       (pdf-view-bookmark "piron1976.pdf"
>                  (filename . "~/tmp/piron1976.pdf")
>                  (position . 1)
>                  (last-modified 25805 5369 546130 641000)
>                  (page . 2)
>                  (slice)
>                  (size . fit-width)
>                  (origin)
>                  (handler . pdf-view-bookmark-jump-handler)))
> 
> This fails with the following backtrace because 
> (cdr (pdf-view-bookmark ...) is a list,

I don't understand: the valid format of save-place-alist is documented
in its doc string, so this looks like a bug in saveplace-pdf-view
package?  Or what am I missing?