History of issue 4 changes

In crates/oh/src/main.rs, lines 918–1025 on 13b27cb2200c246f36d31d83144c047a61ccd07f12b9aa61c2a69c114bb11e2b. 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 918,1025:crates/oh/src/main.rs.