History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on 3556d08e17f96274207d9960d92fe2c0ea228f8642e2ce2d248883071116abfe. 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.