bool listEqualsWithComparer<T>(List<T> a, List<T> b,
    {required bool Function(T i1, T i2) equals}) {
  if (a.length != b.length) {
    return false;
  }
  if (identical(a, b)) {
    return true;
  }
  for (int index = 0; index < a.length; index += 1) {
    if (!equals(a[index], b[index])) {
      return false;
    }
  }
  return true;
}