History of kept 2 changes

In crates/flow/src/cache.rs, lines 463–477 on v0.4.0. 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 463,477:crates/flow/src/cache.rs.