public void CouldUseVecSlice()
        {
            var arr  = new[] { 1, 2, 3 };
            var vecT = new Vec <int>(arr).Slice(1);
            var vec  = new Vec(arr).Slice(1);

            Assert.AreEqual(2, vecT.Length);
            Assert.AreEqual(2, vec.Length);

            Assert.AreEqual(2, vecT[0]);
            Assert.AreEqual(3, vecT[1]);

            Assert.AreEqual(2, vec[0]);
            Assert.AreEqual(3, vec[1]);

            Assert.IsTrue(vec.As <int>().ReferenceEquals(vecT));

            Assert.IsTrue(vecT.Span.SequenceEqual(vec.AsSpan <int>()));
        }