History of issue 4 changes

In crates/oh/src/main.rs, lines 773–880 on 9a777fec4ed9b8ffdd115cbfc4537d1b0caa63a602c7fe17eef7d99ac601ca27. 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 773,880:crates/oh/src/main.rs.