KeyRange bound_(Object lower, Object upper, [ bool lowerOpen, bool upperOpen ])

Source 

static KeyRange bound_(Object lower, Object upper,
    [bool lowerOpen, bool upperOpen]) {
  if (upperOpen != null) {
    return _blink.BlinkIDBKeyRange.instance
        .bound_Callback_4_(lower, upper, lowerOpen, upperOpen);
  }
  if (lowerOpen != null) {
    return _blink.BlinkIDBKeyRange.instance
        .bound_Callback_3_(lower, upper, lowerOpen);
  }
  return _blink.BlinkIDBKeyRange.instance.bound_Callback_2_(lower, upper);
}