Github user kxepal commented on the pull request:
https://github.com/apache/couchdb-couch-replicator/pull/34#issuecomment-204136297
@nickva Right. This saves you one HTTP request and makes checkpoints more
often for free. However, it doesn't removes need to do PUT to _local as not all
the docs we send via _bulk_docs. But if attachments are the rare thing in the
database, this will give the highest profit for free.
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