History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on 5e9dbc57bc31cfc0e9c39e910f5983bb0760ea5027199a71a71e563e6354045b. 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.