Github user rnewson commented on the pull request:
https://github.com/apache/couchdb-couch-mrview/pull/29#issuecomment-143271708
two step validation is the only way this can work, as far as I can see.
group and group_level are both optional fields, so you can't change the default
to an invalid value in order to detect if it's been set once or twice.
@nickva's approach looks good to me. @kxepal can you show a complete and
working alternative that does it all in parse_params? Your example appears not
to be right.
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