History of heartbeat 1 change

In crates/hub/src/flow.rs, lines 1280–1284 on 9041db4e4d925a26a14f3fcafe1a3c4c771bfd49051ebcbd7c1e0cf258547f2d. 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 1280,1284:crates/hub/src/flow.rs.