History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on bd630386001ed3d0fc0d03c01548c193a2297f90b6fedb00b5883259f9ca1ad0. 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.