History of Pool::keep 1 change

In crates/flow/src/cache.rs, lines 114–128 on 0a407108de18356ac23f5398ce7e25d08d5f78b1b54d7a47f8caf1f6c5d016ef. 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 114,128:crates/flow/src/cache.rs.