Value (@NotNull Value optionalTrace) { if (!(optionalTrace instanceof ArrayReference trace)) { throw new UnexpectedValueTypeException("optional trace must be an array value"); } if (!optionalIsPresent(trace)) { return null; } final Value value = trace.getValue(1); if (value instanceof ArrayReference) { return ((ArrayReference)value).getValue(0); } throw new UnexpectedValueTypeException("unexpected format for an optional value"); }