Attribute `s` of `resource.Quantity` is empty

[BruceDu521]

API Version: k8s.io/api v0.29.1 Golang Version: 1.21

I wrote a function to build appv1.Deployment manually, just like below:

func buildDeployment(cpu, mem string) appsv1.Deployment {
	replicas := new(int32)
	*replicas = 1
	deployment := appsv1.Deployment{
		ObjectMeta: metav1.ObjectMeta{
			Name: "my-deployment",
		},
		Spec: appsv1.DeploymentSpec{
			Replicas: replicas,
			Selector: &metav1.LabelSelector{
				MatchLabels: map[string]string{
					"app": "my-app",
				},
			},
			Template: corev1.PodTemplateSpec{
				ObjectMeta: metav1.ObjectMeta{
					Labels: map[string]string{
						"app": "my-app",
					},
				},
				Spec: corev1.PodSpec{
					Containers: []corev1.Container{
						{
							Name:  "my-container",
							Image: "my-image",
							Resources: corev1.ResourceRequirements{
								Limits: corev1.ResourceList{
									corev1.ResourceMemory: resource.MustParse(mem),
									corev1.ResourceCPU:    resource.MustParse(cpu),
								},
							},
						},
					},
				},
			},
		},
	}

	return deployment
}

I did a simple test after, then I found a weird stuff:

func TestBuildDeployment(t *testing.T) {
	deployment := buildDeployment("4", "8Gi")
	mem := deployment.Spec.Template.Spec.Containers[0].Resources.Limits["memory"]
	t.Logf("%+v\n", mem)

	deployment2 := buildDeployment("4", "12Gi")
	mem2 := deployment2.Spec.Template.Spec.Containers[0].Resources.Limits["memory"]
	t.Logf("%+v\n", mem2)
}

// output:
=== RUN   TestBuildDeployment
    e:\..skip..\k8sapp_test.go:12: {i:{value:8589934592 scale:0} d:{Dec:<nil>} s: Format:BinarySI}
    e:\..skip..\k8sapp_test.go:16: {i:{value:12884901888 scale:0} d:{Dec:<nil>} s:12Gi Format:BinarySI}
--- PASS: TestBuildDeployment (0.00s)

Notice the s of Quantity object, 8Gi mem is empty, but 12Gi showed up. When I changed 8Gi to 16Gi, 32Gi, they were all empty string as well.

I have no idea why like this, please help me out, thank you!