/// <summary>
/// Modifies the current set so that it contains only elements that are present either in the current set or in the specified collection, but not both.
/// </summary>
/// <param name="other">The collection to compare to the current set.</param>
public void SymmetricExceptWith(IEnumerable <T> other)
{
var result = ImmutableHashSet <T> .SymmetricExcept(other, this.Origin);
this.Apply(result);
}