In the discussion following http://archives.postgresql.org/pgsql-hackers/2009-09/msg01766.php the consensus was that a hook that allows you to implement a password checking routine as a module "would not hurt".
So here's the patch. I don't think there is documentation required; correct me if I am wrong. Yours, Laurenz Albe
passwd-check-hook.patch
Description: passwd-check-hook.patch
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