Github user nickva commented on the pull request:
https://github.com/apache/couchdb-couch-replicator/pull/30#issuecomment-192488296
@kxepal
Longpolling works because we start the change feed after db has notified
that it has changes, so we ask it for all changes since checkpointed sequence.
So change feeds yield changes since last checkpoint and then stop.
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