History of propagate 2 changes

In crates/hub/src/diffusion.rs, lines 836–838 on dc59d1b56c3d2fe90077436d3acd62ff41bca271ff043b6c6ddbc69ba54aaa19. 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 836,838:crates/hub/src/diffusion.rs.