History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on a3c8288b014138bff6296757c7e494d29e21a102b3f172763effe6f79672dc34. 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.