History of propose 4 changes

In crates/hub/src/diffusion.rs, lines 685–793 on 0a3b244b748fdcfbd077e9a5c447efe1a9cfe7f6530601976d1e2201e5f60bbb. 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.