History of plural 1 change

In src/cli/format.rs, lines 19–21 on 638fb21420d725d401e2059db04f2049b1df3154884c3fca53f65f7e14ffc346. 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.