History of proposal 10 changes

In crates/oh/src/main.rs, lines 1573–1739 on 75491d35c25886496029302d868644f9c2b8bd3c47559f921120abd025fe3c88. 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 1573,1739:crates/oh/src/main.rs.