History of plural 1 change

In src/cli/format.rs, lines 19–21 on a88bcedb088bfece597af7ba8126b1e10a77e752c2d24587b51728655c3b747e. 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.