History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on df68c58de9471dd2f1eada82669cb2adee804c70fd2507876790c00f10edf73f. 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.