Gossipsub v1.3 #687
Description
I'd like to propose releasing a new Gossipsub Version (v1.3) (protocol ID: /meshsub/1.3.0) that would extend v1.2 only by adding support for #684, the Extensions Control Message.
This change would make it easier to deploy future Extensions without requiring a protocol ID change. It would also allow applications to pick and choose which extensions they'd like to use. Please refer to #684 for technical discussions of the extensions control message itself.
The purpose of the issue to field concerns about releasing v1.3 with just #684.
Note, because we are using protobufs, we could start sending Extensions control messages on v1.2, and older endpoints would simply ignore unknown messages. While we could do this, I would recommend against it. It risks sending peers a useless message for little gain.