History of plural 1 change

In src/cli/format.rs, lines 19–21 on 62794ecc7f74b0fe4cfe630382dfd79d720aa35050e9a873eeb8a6d072fd69bb. 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.