History of mark 2 changes

In crates/hub/src/diffusion.rs, lines 181–183 on 4a68f1064b08620ebcdcd6053cc603adc304386c640e46238a0c85da0c3ea163. 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 181,183:crates/hub/src/diffusion.rs.