/// <summary>
/// Smoothly adjusts <see cref="Drawable.Alpha"/> to 0 over time.
/// </summary>
/// <returns>A <see cref="TransformSequence{T}"/> to which further transforms can be added.</returns>
public static TransformSequence <T> FadeOut <T>(this TransformSequence <T> t, double duration = 0, Easing easing = Easing.None)
where T : Drawable
=> t.FadeOut(duration, new DefaultEasingFunction(easing));