@Override
  public boolean equals(Object o) {
    if (this == o) return true;
    if (o == null || getClass() != o.getClass()) return false;
    ArrayBackedFMap<?, ?> map = (ArrayBackedFMap<?, ?>)o;
    if (size() != map.size()) return false;
    return toMapInner().equals(map.toMapInner());
  }
@Override
  public boolean equals(Object o)