///// <summary>Creates an <see cref="IFastList{T}"/> from a <see cref="List{T}"/>.</summary>
///// <typeparam name="T">Type of the element in the supplied array and returned list.</typeparam>
///// <param name="this">The T[] to be converted.</param>
//public static IFastList<T> ToFastList<T>(this List<T> @this) {
// return ( @this ?? new List<T>()).ToArray().ToFastList();
//}
/// <summary>Creates an <see cref="IFastListX{T}"/> from a T[].</summary>
/// <typeparam name="T">Type of the element in the supplied array and returned list.</typeparam>
/// <param name="this">The T[] to be converted.</param>
internal static IFastListX <T> ToFastListX <T>(this T[] @this)
{
return(FastList.NewX(@this ?? new T[0]));
}