History of Pool::key 1 change

In crates/flow/src/cache.rs, lines 62–75 on 454b853a8f4ab0a67adb4e63b125d02057db2a016507e42db48291255969c2ba. 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 62,75:crates/flow/src/cache.rs.