History of Log::checkpoint 2 changes

In crates/hub/src/tlog.rs, lines 380–388 on 9bbca80f777aed6309fc4ad96021778b69027408c2822cdcaedd22027bd0c2b2. 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 380,388:crates/hub/src/tlog.rs.