Github user kxepal commented on the pull request:
https://github.com/apache/couchdb-chttpd/pull/111#issuecomment-206947899
I guess, I figured why and how this could be explained: we don't use _rev
for _local docs as they are not tracked by MVCC feature, but we still want to
provide some sane token for caching and notifying the client that the content
had changed. So Etag forms using the same rules as the _rev, but doc itself
doesn't uses MVCC _rev feature. Sounds good for me.
+1
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