History of Key::free 1 change

In crates/hub/src/throttle.rs, lines 51–56 on 75491d35c25886496029302d868644f9c2b8bd3c47559f921120abd025fe3c88. 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 51,56:crates/hub/src/throttle.rs.