History of plural 1 change

In src/cli/format.rs, lines 19–21 on b037ade16953e826ad80149a11f2cad29ad3010615d795dd395e1fc3711f5463. 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.