History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 107–109 on c419455a82dd6399649a6bf25e2ea61ee2e3c9b7562b50c768f73b766a1e0c5d. 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 107,109:crates/hub/src/protocol.rs.