History of Key::free 1 change

In crates/hub/src/throttle.rs, lines 51–56 on b7d2b0b30b4ac9cf296a69413edcb0026af40ab263445dae89ecdb5030307526. 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.