Hi! Thanks for writing this driver for Swift!

PostgreSQL has supported SCRAM-SHA-256 authentication since version 10 and the community is looking to make it the default password-based authentication method for version 13 (more than a year away, so there is some time). As such, I would strongly recommend to support it 😄

A list of non-libpq based implementations that are implementing SCRAM can be found here: https://wiki.postgresql.org/wiki/List_of_drivers

I have some practice implementing the method so I'm happy to help where needed.