无论类型如何，反序列化ObjectMeta

TL; DR：如何在不事先metav1.ObjectMeta知道k8s API对象的情况下灵活地对其进行解码并检查其顶层结构Kind？

我正在编写一个准入控制器端点，该端点根据字段将metav1.AdmissionReview对象的Request.Object.Raw字段解组为具体的对象Request.Kind-例如

if kind == "Pod" {
    var pod core.Pod
    // ...
    if _, _, err := deserializer.Decode(admissionReview.Request.Object.Raw, nil, &pod); err != nil {
        return nil, err
    }

    annotations := pod.ObjectMeta.Annotations
    // inspect/validate the annotations...

var objMeta core.ObjectMeta
if _, _, err := deserializer.Decode(admissionReview.Request.Object.Raw, nil, &objMeta); err != nil {
        return nil, err
}

// if objMeta is populated, validate the fields, else
// assume it is an object that does not define an ObjectMeta
// as part of its schema.