History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 59–61 on eb56c8bc4d0eeb2db98c6b6f26515240d5142bac75c643b161102bcc9dcfc1d0. 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 59,61:crates/hub/src/protocol.rs.