History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 107–109 on 84e3c09656b2741d9b7f1f9e4772f3fdd4724f85e7da30e517e24db79ed4c3d1. 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.