History of mark 2 changes

In crates/hub/src/diffusion.rs, lines 181–183 on 1000b40a2629d21e3160b89695eff7c7af8b8449ca21a24d49fd5024e92bbd96. 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.