History of backfill 2 changes

In crates/hub/src/diffusion.rs, lines 193–205 on 56b8dbe66974e89b34556d40d352cc5eef65efb7e5c727498b62f082b22f60f6. 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 193,205:crates/hub/src/diffusion.rs.