History of walk 1 change

In crates/flow/src/cache.rs, lines 169–178 on c59b9660678ccd9e5773666a2c29d30855ec8ed147b026a55da7a6deedde048b. 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 169,178:crates/flow/src/cache.rs.