Test and document narayana transactional driver with Oracle. In fact there are some limitation with serializable isolation level for Oracle and some extra configuration might be needed for certain Oracle versions. Document the extra needed configurations when running the narayana transactional driver against the Oracle DB.
See related thread: https://narayana.zulipchat.com/#narrow/channel/323715-developers/topic/ORA-08177.20with.20Narayana.20Transactional.20Driver