Github user rnewson commented on the pull request:
https://github.com/apache/couchdb-couch-mrview/pull/29#issuecomment-142972064
``` "group" ->
case parse_boolean(Val) of
true -> Args#mrargs{group_level=exact};
_ -> Args#mrargs{group_level=0}
end;```
I'm reading that to mean group=false _is_ group_level=0 and hence that
group=true&group_level=true means 'group it AND don't group it'.
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