Currently, the new Actors use the "coder" to deserialize responses, and also to string-ify requests for logging.  However, they do not use the "coder" to serialize the requests for transmission.  As a result, the "serialization.provider" property must be provided for any Actor that wishes to use something other than the default serialization property.  This is both a nuisance and a potential source of incompatibility with the "coder" used to deserialize the responses.

The Actors should use their "coder" for both serialization and deserialization.