History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 59–61 on 6e7dfa0a42b996d4521e15039a06833f4efe8073bc815ee731b6233b2cf8aefa. 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 59,61:crates/hub/src/protocol.rs.