Re: Custom oauth validator options

> Overall, +1 that this limitation is real and worth discussing.I’ll plan to send a patch shortly exploring option (b).

Personally I would go with either (a) or (c), and I was planning to
clean up / improve / share my (c) patch as a second attempt for this
thread, if it didn't receive any replies. I can still do that, so that
we have multiple test implementations. (b) seemed a not as nice design
to me, but maybe you find a better way to implement it than I did.

Also now I really like the idea of the PGC_HBA, if there's a way for
users to configure it without depending on line numbers or other
easy-to-change details.