[
  {
    "bases": [
      "DefaultChild"
    ],
    "fields": [
      "before",
      "value",
      "after",
      "added"
    ]
  },
  {
    "payload": {},
    "source": {
      "before": 10,
      "value": 3,
      "after": 30,
      "added": 40
    },
    "generated": {
      "before": 10,
      "value": 3,
      "after": 30,
      "added": 40
    }
  },
  {
    "payload": {
      "value": 8
    },
    "source": {
      "before": 10,
      "value": 8,
      "after": 30,
      "added": 40
    },
    "generated": {
      "before": 10,
      "value": 8,
      "after": 30,
      "added": 40
    }
  }
]