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Is this something that is done for every network-affecting pull/commit? Once per release?

What kind of network changes trigger a protocol bump?

Do pull-requesters need to do this, or just the puller?

Where would I go to bump the protocol version?

you could start reading http://dev.minetest.net/Network_Protocol

twoelk wrote:you could start reading http://dev.minetest.net/Network_Protocol

I've read it but it doesn't say anything about protocol bumps or versioning, other than some compatibility things between pre- and post- version 25.