History of ReferenceIndex::indexOf 1 change

In src/references.ts, lines 54–81 on 5888949525ecd6d26634917e79c97b97ff0b98554e3b0d94387d9fcd3775c7d7. 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.