{
  "items": [
    {
      … 2 unchanged keys
    },
    + {
      + "id": "d",
      + "v": 4
    + },
    > moved $.items[0] -> $.items[2] (id="a")
    {
      … 2 unchanged keys
    },
    > removed $.items[2]
    - {
      - "id": "c",
      - "v": 3
    - }
  ],
  "meta": {
    "keep": 1,
    - "drop": {
      - "x": 1
    - },
    "tail": 2,
    + "add": 3
  }
}
