save/saveAsync ignores if_exists and if_not_exists in options - always upserts

[vgjenks]

If I pass "{ if_exists: true }" or "{ if_not_exists: false }" as an option to save(), it is ignored. The behavior is always an upsert. I will always get a new record if I change one of the key values and run the insert. I would expect an update only to happen if the record exists, and not to see a new record.