History of walk 1 change

In crates/flow/src/cache.rs, lines 169–178 on af7902eab78ac384aa7d405f2e0a88804e381d8ce81b2b37c60da50bbdb4c7b1. 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.