Github user kxepal commented on the pull request:
https://github.com/apache/couchdb-couch-mrview/pull/29#issuecomment-142974896
Group it maybe (:
I think 400 here is technically correct, while users could be confused. I
see the only sane case to have `group=true&group_level=0` here if user made
some views request generator from UI: there he'll have group checkbox and some
select of grouping level - he'll never know about what "exact" is.
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