History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 572–594 on b951c58734e86e85465b9f0ecc65ea5642d3dedcf5e3ef481ca32c9790c15dfe. 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 572,594:crates/hub/src/protocol.rs.