History of ReferenceIndex::indexOf 1 change

In src/references.ts, lines 54–81 on 263de209e5ba12114b0f2f9fcb466521ab1599ad71ec2b571b53d8811ccf6409. 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.