Github user benoitc commented on the pull request:
https://github.com/apache/couchdb-couch-mrview/pull/2#issuecomment-60155037
You can find some description of the original patch on the mailing list.
Also this commit:
https://github.com/rcouch/couchdb-couch-mrview/commit/eaa87ee5e4fed035ac34d12328f3433a14ba1942
The index of keys by sequence is here to allows filtering on a key range.
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