History of walk 1 change

In crates/flow/src/cache.rs, lines 230–239 on 1e6b9fb1e73fdbe8e22c781af20f6da643afffddf74404f399eb9f925d85b04f. 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 230,239:crates/flow/src/cache.rs.