Hi Sebastian,
> if a flush slips in between statements on a slow animal, it also
> passes without the fix, so it may not catch a regression there.
Good point. Pinning the flush in the test so it cannot pass without
the fix is easy to add; I will leave that for Ilya's v2 unless he
would rather I post it.
Thanks also for the independent confirmation and the autovacuum
numbers, and for digging up 81e82a2bd48 as a precedent. That settles
the "just an approximation" question.
Regards,
Manu