Re: Add new protocol message to change GUCs for usage with future protocol-only GUCs - Mailing list pgsql-hackers

On Mon, Aug 19, 2024 at 1:54 PM Jelte Fennema-Nio <postgres@jeltef.nl> wrote:
> My point is that the code that breaks, actually wants to be broken in this case.

I'll turn this around then and assume for a moment that this is true:
no matter what the use cases are, they all want to be broken for
correctness. If this version change is allowed to break both the
endpoints and any intermediaries on the connection, why have we chosen
30001 as the new reported version as opposed to, say, 4?

Put another way: for a middlebox on the connection (which may be
passively observing, but also maybe actively adding new messages to
the stream), what is guaranteed to remain the same in the protocol
across a minor version bump? Hopefully the answer isn't "nothing"?

--Jacob