History of issue 4 changes

In crates/oh/src/main.rs, lines 759–866 on 180dc43ad0e062d9029ba7dc76288a1a1ce7afa2b7407d5ae41df71697f35a82. 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 759,866:crates/oh/src/main.rs.