History of deepen 3 changes

In src/cli/sync.rs, lines 848–870 on 4224eb6b4488161cc368dd76e58c9584376ea608f4d3f124412bce6a8e146318. 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 848,870:src/cli/sync.rs.