History of proposal 9 changes

In crates/oh/src/main.rs, lines 1441–1607 on api-unknown-fields. 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 1441,1607:crates/oh/src/main.rs.