Github user davisp commented on the issue:
https://github.com/apache/couchdb-couch/pull/229
Reduce functions are complicated so that makes sense. :D
Unfortunately there's not a whole lot we can do without inventing a
builtin-reduce specific error API/protocol which strikes me as a bit ugly
considering it leaves non-builtin-reduce functions out. I'll make comments for
each of your notes individually.
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