private bool Equals(IDictionaryDifference <TKey, TVal> other) => EntriesOnlyOnLeft.ReadOnlyIsEquivalentTo(other.EntriesOnlyOnLeft) && EntriesOnlyOnRight.ReadOnlyIsEquivalentTo(other.EntriesOnlyOnRight) && EntriesInCommon.ReadOnlyIsEquivalentTo(other.EntriesInCommon) && EntriesDiffering.ReadOnlyIsEquivalentTo(other.EntriesDiffering);
