History of dispatch 4 changes

In crates/hub/src/protocol.rs, lines 622–644 on 80642fde09cc3932f252db2388d4e84b5ea6e36f59f345ce13117e8db11e036b. 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.