This v5* looks good to me, except it will need some further
modification if PeterE's suggestion [1] to keep quotes for the
MixedCase GUCs is adopted.
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[1] https://www.postgresql.org/message-id/9e7802b2-2cf2-4c2d-b680-b2ccb9db1d2f%40eisentraut.org
Kind Regards,
Peter Smith.
Futjisu Australia.