History of plural 1 change

In src/cli/format.rs, lines 19–21 on 3c5c6ad2518a0e9810d532fa788dbe8fc6c1c426cefc174d1df4e5cf5949cf32. 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.