BTW, the reason I wanted to check this, is that a certain very popular open source
messaging system (you know the one I mean ;) ), in it's out of the box configuration,
batches up acks in AUTO_ACK_MODE - so basically AUTO_ACK has the same delivery guarantee
as DUPS_OK, which seems somewhat disingenuous, but probably helps them on benchmarks.
Which leads to the question of whether our out of the box configuration should be JMS spec
compliant, or optimised for performance and the user has to actively set a flag
--JMScompliant. Currently we are out of the box JMS spec compliant.
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