History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 580–602 on 367f34b8e590b83920b391fbe78d201500c6b051145d52f8f6f2d9c060f8fa67. 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 580,602:crates/hub/src/protocol.rs.