Is anyone using db_user_namespace?

Over in pgsql-hackers, I've proposed removing the db_user_namespace
parameter in v17 [0].  I am personally not aware of anyone using this
parameter, but I wanted to give folks an opportunity to object in case they
are using it (or are aware of someone who is).

[0] https://postgr.es/m/20230630200509.GA2830328%40nathanxps13

-- 
Nathan Bossart
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