History of Pool::key 1 change

In crates/flow/src/cache.rs, lines 157–170 on 270d5583a25b5d0a29902b3dd5df465dbd03ef835a9c670727bb186a631b7974. 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 157,170:crates/flow/src/cache.rs.