History of plural 1 change

In src/cli/format.rs, lines 19–21 on f8c695764c957deb54d78e50332c677f5cda21b534cd2eb0f8d843d1fbf4a27c. 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.