History of checkpoint 1 change

In crates/hub/src/flow.rs, lines 1434–1450 on 27babfa165801e966a746a009b6f5cf8d610b3866e1200163b3ae02b9a8eb8d5. 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 1434,1450:crates/hub/src/flow.rs.