Github user rnewson commented on the pull request:
https://github.com/apache/couchdb-couch-mrview/pull/29#issuecomment-142956487
group=false&group_level=0 -> valid request (no grouping)
group=false&group_level=1 or higher -> 400 bad request
group=false&group_level=exact -> 400 bad request
group=true&group_level=exact -> valid request (group_level=exact)
group=true&group_level=1 or higher -> valid request (group_level from
group_level argument)
group=true&group_level=0 -> 400 bad request
if group parameter is non-boolean, it's treated the same as if it's false
(i.e, it is not currently an error to say group=foobar), therefore the above
cases for group=false are repeated for non-boolean value.
@kocolosk @nickva
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