public void TestShrink()
{
var data = new byte[] { 1, 2, 3, 4 };
using (var stm = new PooledMemoryStream())
{
stm.Write(data, 0, data.Length);
stm.Shrink(2);
Assert.Equal(data.AsSpan(0, 2).ToArray(), stm.ToArray());
}
}