History of Pool::key 1 change

In crates/flow/src/cache.rs, lines 84–97 on c2430ac3b728f80a32926e6d0540b6ef68dec852f039d2cf4b8afdea7d25e855. 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 84,97:crates/flow/src/cache.rs.