History of plural 1 change

In src/cli/format.rs, lines 19–21 on 992467d31d263dd85ae5804816f5d39ee7a0421d28a3c9bed735a17b6e77d7c1. 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.