History of Pool::key 1 change

In crates/flow/src/cache.rs, lines 62–75 on e20897216221a7410ab42d12ea6161110e26bc8bd1b3f13e31453f1e9ff2aec0. 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.