History of ReferenceIndex::indexOf 1 change

In src/references.ts, lines 54–81 on 092b8bf9f2acaf35cfa9afe209d25235f9ad08b4f3a7e3471fb7263e174f521e. 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 54,81:src/references.ts.