History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 636–658 on fb8f35d025ab857f462b1a5d52b5d40fcddf93f4317183f7e0fb0216660d0d32. 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 636,658:crates/hub/src/protocol.rs.