{
  "$defs": {
    "ChoicesParent": {
      "properties": {
        "old": {
          "default": 1,
          "title": "Old",
          "type": "integer"
        }
      },
      "title": "ChoicesParent",
      "type": "object",
      "x-is-base-class": true
    }
  },
  "allOf": [
    {
      "$ref": "#/$defs/ChoicesParent"
    }
  ],
  "properties": {
    "new": {
      "default": 2,
      "title": "New",
      "type": "integer"
    }
  },
  "title": "ChoicesChild",
  "type": "object"
}