When you need to snap value, e.g. each 45 from 0 to 360

SnapCurve.cs

private AnimationCurve GetSnapCurve(float min, float max, float snapAt, float snapAmount, WrapMode wrapMode = WrapMode.Clamp)
{
    var keyFrames = new List<Keyframe>
            {
                new Keyframe(0, min),
                new Keyframe(1, max)
            };

    for (float i = snapAt; i < max; i += snapAt)
    {
        keyFrames.Add(new Keyframe(i / max, i, 0, 0, snapAmount, snapAmount));
    }

    return new AnimationCurve(keyFrames.ToArray())
    {
        preWrapMode = wrapMode,
        postWrapMode = wrapMode
    };
}