History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 59–61 on a7e6e8e6094c0a836ddde37499e7b44d64db9db4a3404d871eaa92682aea12c6. 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.