bug#29220: 26.0.90; eieio-persistent-read fail to restore saved object.

[Eric Abrahamsen]

On 11/29/17 10:15 AM, Stefan Monnier wrote:
>> That's exactly what Noam was saying! The implementation of objects
>> changed from 25 to 26, and thus their printed representation also
>> changed.
>
> Indeed.  But the subject mentions "...eieio-persistent-read..." and
> eieio-persistent was designed specifically to try and avoid dependence
> on how Emacs represents EIEIO objects.  The problem here is that
> eieio-persistent doesn't support hash-tables, so the EIEIO objects in
> the hash-tables are printed with `princ` (i.e. in all their internal
> glory) rather than going through eieio-persistent.
>
> So I think the real fix here is to extend eieio-persistent with support
> for hash-tables.

Just hash tables? How about vectors? There seem to be many places where
objects could be hiding...