/// <summary>
/// Removes the maximal key-value pair from this map.
/// </summary>
/// <returns></returns>
public ImmSortedMap <TKey, TValue> RemoveMax()
{
if (Root.IsEmpty)
{
throw Errors.Is_empty;
}
return(Root.RemoveMax(Lineage.Mutable()).WrapMap(Comparer));
}