History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on 60f11b71a74091b01385c654b0011014d4036deb49e2576b6d2691242cb260bd. 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 51,53:crates/hub/src/protocol.rs.