origin: Metadata of the `kubeadmin` user profile doesn't contain a `uid`

The kubeadmin user profile doesn’t provide the kube:admin user uid.

Version

OpenShift 4.3.9

Steps To Reproduce

1. Get the profile of an standard user:

The profile of a user created with an identity provider such as the htpasswd identity provider contains a metadata.uid field.

╰─ curl -k -H "Authorization: Bearer xxxxxxx" "https://api.test-ocp43.codereadyqe.com:6443/apis/user.openshift.io/v1/users/~"
{
  "kind": "User",
  "apiVersion": "user.openshift.io/v1",
  "metadata": {
    "name": "user",
    "selfLink": "/apis/user.openshift.io/v1/users/user",
    "uid": "e01e78aa-50d9-482e-8bb4-3442a5247313",
    "resourceVersion": "5462325",
    "creationTimestamp": "2020-04-17T09:47:59Z"
  },
  "identities": [
    "htpasswd:user"
  ],
  "groups": [
    "system:authenticated",
    "system:authenticated:oauth"
  ]
}

1. In comparison, the profile of the kubeadmin user doesn’t contain a uid and seems quite incomplete:

╰─ curl -k -H "Authorization: Bearer xxxxxxxxx" "https://api.test-ocp43.codereadyqe.com:6443/apis/user.openshift.io/v1/users/~"
{
  "kind": "User",
  "apiVersion": "user.openshift.io/v1",
  "metadata": {
    "name": "kube:admin",
    "selfLink": "/apis/user.openshift.io/v1/users/kube%3Aadmin",
    "creationTimestamp": null
  },
  "identities": null,
  "groups": [
    "system:authenticated",
    "system:cluster-admins"
  ]
}                                                                                                                                                                                                                                            

Current Result

The profile of the kubeadmin user doesn’t contain a metadata.uid field and seems quite incomplete

Expected Result

Shouldn’t the profile of the kubeadmin user also contain a metadata.uid field as it is the case for any other user ?