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v360: OutputBuffer: dup listeners before iterating

zendesk-deploy released this 22 Dec 01:23

fa0cc33

Array#delete inside of the #each can lead to the other listeners not
being reachable.

This is also the behavior of ThreadSafe::Cache#each_pair, which we don't
"really" need, but might want to use since ThreadSafe::Array is just a
regular Array in MRI.

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