Github user davisp commented on the issue:
https://github.com/apache/couchdb-couch-mrview/pull/47
I believe the is_list/1 check was an attempt at seeing if the value was a
list-of-characters-string that could be passed to jiffy for decoding. Ie, it
was an earlier attempt that forgot that startkey and endkey can be arbitrary
JSON values and as such, lists of things as you discovered.
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