[pheanstalk] Requeuing a message should not acknowledge it beforehand #722
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Requeuing a message in Beanstalk means to release a reserved message:
https://github.com/beanstalkd/beanstalkd/blob/b5a6f7a23a368ffb31fbf48cdffe95541166d3fa/doc/protocol.txt#L85-L102
If the message is acknowledged beforehand (i.e. deleted), it can't be released anymore.
If you are OK with the modification, I will add a unit test.