Thanks for the PR @allen-munsch !

Could you elaborate a bit on what your concern is here? This section of the code is specifying names for the various native protocols supported by this driver. You can find specifications for each version of the protocol in the "doc" directory of the Cassandra repo (see https://github.com/apache/cassandra/tree/trunk/doc as an example).

This protocol is versioned independently of Cassandra itself; Cassandra 4.0 provides the first full implementation of a non-beta version of protocol version 5, for instance. With regard to your PR specifically there is no version 21 of the native protocol that I am aware of, either in Cassandra itself or DSE.

@absurdfarce ah, I was trying to figure out how to do an upgrade. I think I misunderstood what those versions meant.

Thanks for the pointing out that information, and highlighting the versioning.