@Override
  public boolean equalsByReference(@NotNull KeyFMap o) {
    if (this == o) return true;
    if (!(o instanceof OneElementFMap)) return false;

    OneElementFMap<?> map = (OneElementFMap<?>)o;
    return myKey == map.myKey && myValue == map.myValue;
  }
@Override
  public boolean equalsByReference(@NotNull KeyFMap o)