{
  "description": "A serializable union must keep caller schema extensions unchanged.",
  "properties": {
    "value": {
      "anyOf": [
        {
          "type": "integer",
          "x-python-union-branch": 17
        },
        {
          "type": "string",
          "x-python-union-branch": {
            "label": "metadata"
          }
        }
      ],
      "title": "Value"
    }
  },
  "required": [
    "value"
  ],
  "title": "Serializable",
  "type": "object"
}