`AutoCastVariable`s will still be casted.

*   `tf.data`:

    *   `tf.data.experimental.service.DispatchServer` now takes a config tuple
        instead of individual arguments. Usages should be updated to
        `tf.data.experimental.service.DispatchServer(dispatcher_config)`.
    *   `tf.data.experimental.service.WorkerServer` now takes a config tuple