A batch event as the queue keeps it: with the identity it was logged under,
which decides its batch (identityBatchesOf). The identity is the queue's
stamp, read once where the queued event is read (pigeonBatchEventOf); a
batch of an upload holds the event without it.
A batch event as the queue keeps it: with the identity it was logged under, which decides its batch (
identityBatchesOf). The identity is the queue's stamp, read once where the queued event is read (pigeonBatchEventOf); a batch of an upload holds the event without it.