/// <summary>
/// Combines all exisiting values into single IEnumerable
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="this"></param>
/// <param name="others"></param>
/// <returns></returns>
public static IEnumerable <T> Union <T>(this Maybe <T> @this, params Maybe <T>[] others)
{
return(@this.Union(others.WhereValueExist()));
}