- pep8 cleanup
- The engine-level error handling and wrapping routines will now
take effect in all engine connection use cases, including
when user-custom connect routines are used via the
:paramref:`.create_engine.creator` parameter, as well as when
the :class:`.Connection` encounters a connection error on
revalidation.
fixes #3266
- document / work around that dialect_options isn't necessarily there