I've discovered (the hard way) that if you run `make installcheck` with default_transaction_isolation = 'serializable' and you have a serializable read write transaction sitting idle (or prepared) that the "transactions" test will block indefinitely waiting for a safe time to run, because of the test of the READ ONLY DEFERRABLE code. I think that's OK, but figured I should make people aware of the fact and see if everyone agrees. I will admit that it can be confusing until you find the idle or prepared transaction. -Kevin
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