By watching the _changes feed I can detect when a document is deleted (via the 
“deleted” key), but is there a way to tell when a new document is created? 
There doesn’t seem to be a corresponding extra key in the notification in this 
case.

I am tempted to look for a prefix of “1-“ in the revision, but I’m pretty sure 
that this is an implementation detail and revision IDs should be treated as 
purely opaque cookies, amiright?

The cheapest alternative I can think of is to do a HEAD on the _all_docs view 
after I get a new notification from _changes, and see if its ETag has changed.

—Jens

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