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

[Robert Pluim]

>>>>> On Mon, 25 Mar 2019 10:35:32 -0700, Eric Abrahamsen 
>>>>> <eric@ericabrahamsen.net> said:
    >> Perhaps it would be better to revert and reintroduce your
    >> changes after further testing ? Taking time over this is better
    >> than causing data loss for gnus users.

    Eric> That's the conclusion I'm coming to, yes.

FWIW, gnus on master has been working flawlessly for me since you
pushed the hash table changes. People running master should expect
occasional breakage, so I wouldnʼt give up too soon.

Robert