History of plural 1 change

In src/cli/format.rs, lines 19–21 on 0c15e46784795a7e5b0f50ef048d027f89d2a67d917f82ed2d505135f4064771. 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.