History of Pool::settle 3 changes

In crates/flow/src/cache.rs, lines 272–295 on 412808f9f76943fa503d58ab9a24fb477121f64dc5eb29a05cd2036526ebdf67. 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.