History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on e71846aa07b9b70b04e7b7fde94498cb1301d6ecdb9059df648fa4f1401ff428. 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.