History of ReferenceIndex::indexOf 1 change

In src/references.ts, lines 54–81 on d8c9bdc51ee0ed7db6b8f371982286d514380f59be22b2079e6422efe7576d0d. 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.