Github user eiri commented on the issue:
https://github.com/apache/couchdb-couch-mrview/pull/47
We are _not_ calling JSON_DECODE twice, this is not the problem here. We
are getting list of query attributes as a json payload, decoding it
[here](https://github.com/apache/couchdb-chttpd/blob/master/src/chttpd_view.erl#L56)
and then passing them to `couch_mrview_http:parse_params/3`, assuming that it
is idempotent to values of the attributes to be string of json or already
decoded terms. And `parse_json` respects this for ints, strings, booleans or
hashes, but assumes that _any_ list is a stringified json, while jiffy itself
treat list of binaries as a decoded json array (`[<<"a">>, <<"b">>] =
jiffy:decode(jiffy:encode([<<"a">>, <<"b">>]))`).
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