History of propose 4 changes

In crates/hub/src/diffusion.rs, lines 685–793 on 7f283f8e8b97707412b1fa72430695d29c12832ae86aee49f1e3cf0027b6c879. 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.