> The current macaddr datatype needs to be kept for some time by renaming
> it without changing OID and use the newer one for further usage.

>From the point of view of a driver maintainer... Npgsql looks up data types
by their name - upon first connection to a database it queries pg_type and
maps its internal data type handlers based on name. This allows it to avoid
hardcoding data type OIDs in source code, and easily handle user-defined
data types as well (enums, composites...). So a sudden rename of a datatype
would definitely cause a problem. Of course it's possible to first check
the server version and act accordingly but it seems to complicate things

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