/// <summary>IForEachable2{TItem} implementation</summary>
 public void  ForEach(FastIteratorFunctor <TItem> functor)
 {
     TItem[] array = _array;
     for (int i = 0; i < array.Length; i++)
     {
         functor.Invoke(array[i]);
     }
 }
 /// <inheritsdoc/>
 void IForEachable2 <TItem> .ForEach(FastIteratorFunctor <TItem> functor) => ForEach(functor);