History of plural 1 change

In src/cli/format.rs, lines 19–21 on 540b229288bab5a876f15c26328c148408296c4e7b82e434f1cab0619faa20bd. 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 19,21:src/cli/format.rs.