History of checkpoint 4 changes

In src/cli/workspace.rs, lines 1920–1933 on 170bb436e1d529fb62a41b18bbccdc0f1deb6dee13e8dec207c6165ab859eb0b. 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 1920,1933:src/cli/workspace.rs.