PrimeTween's custom OutBounce animation

public static Sequence PositionOutBounce([NotNull] Transform target, Vector3 endValue, float duration, float bounceAmplitude, int numBounces = 3, float stiffness = 0.5f, bool useUnscaledTime = false)
    => CustomOutBounce(target, (t, s) => Tween.Position(t, s), endValue, duration, bounceAmplitude, numBounces, stiffness, t => t.position, useUnscaledTime);

public static Sequence LocalPositionOutBounce([NotNull] Transform target, Vector3 endValue, float duration, float bounceAmplitude, int numBounces = 3, float stiffness = 0.5f, bool useUnscaledTime = false)
    => CustomOutBounce(target, (t, s) => Tween.LocalPosition(t, s), endValue, duration, bounceAmplitude, numBounces, stiffness, t => t.localPosition, useUnscaledTime);

static Sequence CustomOutBounce([NotNull] Transform target, [NotNull] Func<Transform, TweenSettings<Vector3>, Tween> animFunc, Vector3 endValue, float duration, float bounceAmplitude, int numBounces, float stiffness, [NotNull] Func<Transform, Vector3> getPos, bool useUnscaledTime) {
    if (bounceAmplitude == 0) {
        Debug.LogWarning("Please provide non-zero " + nameof(bounceAmplitude) + ".");
    }
    if (numBounces < 0 || numBounces > 10) {
        Debug.LogError("'" + nameof(numBounces) + "' should be >= 0 and <= 10.");
        numBounces = Mathf.Clamp(numBounces, 0, 10);
    }
    if (stiffness < 0 || stiffness > 5) {
        Debug.LogError("'" + nameof(stiffness) + "' should be >= 0 and <= 5.");
        stiffness = Mathf.Clamp(stiffness, 0, 5);
    }
    stiffness += 1;
    // move durations: x + x/stiffness + x/stiffness^2 + x/stiffness^3...
    float x = 1;
    for (int i = 1; i <= numBounces; i++) {
        x += 1 / Mathf.Pow(stiffness, i);
    }
    var curDur = duration / x;
    var sequence = Sequence.Create(animFunc(target, new TweenSettings<Vector3>(endValue, curDur, Ease.InSine, useUnscaledTime: useUnscaledTime)));
    var bounceVector = (getPos(target) - endValue).normalized * bounceAmplitude;
    for (int i = 1; i <= numBounces; i++) {
        curDur /= stiffness;
        sequence.Chain(animFunc(target, new TweenSettings<Vector3>(endValue + bounceVector, curDur / 2f, Ease.OutSine, 2, CycleMode.Rewind, useUnscaledTime: useUnscaledTime)));
        bounceVector /= stiffness * 2;
    }
    return sequence;
}