无法将[] interface {}转换为[] byte：“ interface {}是[] interface []，而不是[] uint8”

我正在解析大型JSON文件，我需要解析其子对象items。
您可以看到items类型为[]interface{}：

我成功解析了第一个对象，map[]string]interface{}但是在此之后，我尝试解析pods["items"]类型正确的对象[]interface{}，并将其转换[]byte为json.Unmarshal函数，但失败了：

interface {}是[] interface []，不是[] uint8

这是要重现的代码：

package main

import (
    "encoding/json"
    "fmt"
)

var mytest string = `
{
   "kind":"PodList",
   "apiVersion":"v1",
   "metadata":{
     
   },
   "items":[{
         "metadata":{
            "name":"super-user-pod5551",
            "namespace":"kube-system",
            "selfLink":"/api/v1/namespaces/kube-system/pods/super-user-pod5551",
            "uid":"fe9cf599-6e82-4a1b-8db5-5e319a58e1da"
         },
         "spec":{
            "volumes":[
               {
                  "name":"bootstrap-signer-token-dmp5q",
                  "secret":{
                     "secretName":"bootstrap-signer-token-dmp5q",
                     "defaultMode":420
                  }
               }
            ],
            "containers":[
               {
                  "name":"redis",
                  "image":"busybox:1.28",
                  "resources":{
                     
                  },
                  "volumeMounts":[
                     {
                        "name":"bootstrap-signer-token-dmp5q",
                        "readOnly":true,
                        "mountPath":"/var/run/secrets/kubernetes.io/serviceaccount"
                     }
                  ],
                  "terminationMessagePath":"/dev/termination-log",
                  "terminationMessagePolicy":"File",
                  "imagePullPolicy":"IfNotPresent",
                  "securityContext":{
                     "capabilities":{
                        "add":[
                           "SYS_TIME"
                        ]
                     }
                  }
               }
            ],
            "restartPolicy":"Always",
            "terminationGracePeriodSeconds":30,
            "schedulerName":"default-scheduler"
         },
         "status":{
            "phase":"Failed",
            "message":"The node was low on resource: ephemeral-storage. ",
            "reason":"Evicted",
            "startTime":"2020-05-10T11:13:33Z"
         }
      }
    ]
}
`


func main(){

    //var pods interface{}
    var pods map[string]interface{}
    err := json.Unmarshal([]byte(mytest), &pods)
    fmt.Println(err)
    //var spec map[string]interface{}
    //err = json.Unmarshal(byte(pods["items"]), &pods["items"])
    var items []interface{}

    err = json.Unmarshal(pods["items"].([]byte), &items)
    fmt.Println(err)

}

链接到GoPlayground。