History of plural 1 change

In src/cli/format.rs, lines 19–21 on 4dee277c327ae9e908daff85af60474484fb0ccbc9fdf4262a754b607aa3e6f9. 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.