History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on 2a83f5303458253ca676b38c479a96a8469bc39723ac7b74e0da95b8fcfcb673. 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.