https://github.com/couchbase/couchnode/blob/1eface945c62089710f950a482870e2f9114085d/src/constants.cpp#L123
https://github.com/couchbase/couchnode/blob/1eface945c62089710f950a482870e2f9114085d/src/constants.cpp#L135
The undefined values become 0 when ORed so have no effect
Reported by Maria Shodunke
JSCBC-1049 mutate subdocument fails even if createPath option is provided