History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 59–61 on b91e2d81b3f1ae44682844af0ef18eed1173035d81ecd68bd77ec47b036c5d8c. 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.