And if you set MariaDB to not have Internet connectivity, it attempts to accomplish this by setting the TCP port to 0. Ostensibly because it's not supposed to

And if you set MariaDB to not have Internet connectivity, it attempts to accomplish this by setting the TCP port to 0. Ostensibly because it's not supposed to be a valid TCP port, except it actually is on thousands and thousands of systems. So I don't know if the check you're referencing is evaluated when someone sets their instance of MariaDB to "not" be internet accessible.