History of plural 1 change

In src/cli/format.rs, lines 19–21 on 19555025a2ac602ad32d7752cc1d2855d8f2871080c62b99e5a2a49b34652590. 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.