History of propose 4 changes

In crates/hub/src/diffusion.rs, lines 685–793 on 4fa0da126b702d23f945ff2890a0944d8750e155c557b5cca3ebfeedeef908b7. 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 685,793:crates/hub/src/diffusion.rs.