//- Here is a test for the fixed 300ms precompiled fiber
        [UnityTest] public IEnumerator InstanceGo()
        {
            start = Time.realtimeSinceStartup;

            //- and they are first run when Go is called explicitly or implicitly with WaitFor or AsCoroutine.
            fiber300Ms.Go(); // in this case superfluous since AsCoroutine() calls it implicitly (as does WaitFor(Fiber))

            //- We can mix fibers with coroutines where it makes sense
            yield return(fiber300Ms.AsCoroutine());

            Assert.AreEqual(0.3f, Time.realtimeSinceStartup - start, delta: 0.05f);
        }