bug#33653: 27.0.50; Change Gnus obarrays-as-hash-tables into real hash tables

[Eric Abrahamsen]

Katsumi Yamaoka <yamaoka@jpl.org> writes:

> Hi,
>
> Gnus got not to work for groups of which the group name contains
> non-ASCII letters.  For instance, I got this error when trying
> to update the "nnml:テスト" group using `M-g'[1]:
>
> nnml:\343\203\206\343\202\271\343\203\210 error: No such group: テスト
>
> When trying to enter the group using `0 RET'[2] I got:
>
> Group nnml:\343\203\206\343\202\271\343\203\210 couldn't be activated
>
> Those raw bytes are utf-8 encoded "テスト", that is also used in
> the group entry in gnus-newsrc-alist saved in the ~/.newsrc.eld
> file as follows:
>
> ("nnml:\343\203\206\343\202\271\343\203\210" 1 nil ((unexist) (seen (1
> . 5))) "nnml:" ((timestamp 23704 11958)))

Yes, this is something I screwed up in c1b63af445. Gnus has always
stored group names as raw bytes in.newsrc.eld (at least I believe it
has, you probably know better than I do, it does in my experiments with
Emacs 26, anyway), and only encodes during display. But obviously I've
messed something up between file persistence and display, and I'm
working on sorting it out.