History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 610–632 on 8ad8e656a3a654690a1c7577e34a8a744611e1a0119167bc3209cd5c87c18787. 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 610,632:crates/hub/src/protocol.rs.