History of refOf 1 change

In src/diff.ts, lines 20–22 on a6b460b1ec04e7035430d176547dc4038a0935942236e48567678891e94b8fb2. 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 20,22:src/diff.ts.