History of supersedes 2 changes

In crates/hub/src/flow.rs, lines 545–547 on 8501fd5815b9e83cd465032461acf282f4538f115450cef2e0272e12284fd83b. 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 545,547:crates/hub/src/flow.rs.