History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 622–644 on 73c01b3448ee739021595599fee16f03f873a1ba6a415681d042b7b237569810. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 622,644:crates/hub/src/protocol.rs.