Sitecore Item Comparer

Sitecore Item Comparer

public class ItemComparer : IEqualityComparer<Item>
{
        public bool Equals(Item x, Item y)
        {
            return x.ID == y.ID;
        }

        public int GetHashCode(Item obj)
        {
            return obj.ID.GetHashCode();
        }
 }

Thanks. Why this isn't native, one can only guess. I wonder if they use their own APIs.