History of Pool::settle 3 changes

In crates/flow/src/cache.rs, lines 272–295 on 1b160d372d9ec16fa18a654b8fe78e7d39db4d21a76872d895dc863142f6f281. 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 272,295:crates/flow/src/cache.rs.