internal void CopyTo(IntList target)
 {
     if (target != null)
     {
         target.Clear();
         for (int i = 0; i < this.Count; i++)
         {
             target.Add(this[i]);
         }
     }
 }
 internal void CopyTo(IntList target)
 {
     if (target != null)
     {
         target.Clear();
         for (int i = 0; i < this.Count; i++)
         {
             target.Add(this[i]);
         }
     }
 }