History of HubBackend::block 2 changes

In crates/hub/src/protocol.rs, lines 51–53 on d336629ffa906b6783adf44337015e3c3d9d4437a6a4f97734367f903674db51. 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.