History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 45–47 on 25ab8c73514a55e8b07d0ffe2bac90b7c77f7d151d8c80b41214dd17ae4cc4dc. 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 45,47:crates/hub/src/protocol.rs.