History of plural 1 change

In src/cli/format.rs, lines 19–21 on f57bf6702628cfd73668d771071a01c34e4a363eb9029e74b434799743df934b. 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.