{
  "name": "invalid/unknown-column-key",
  "rules": {
    "columns": [
      {
        "key": "v",
        "typ": "text"
      }
    ]
  },
  "rows": [
    {
      "v": "x"
    }
  ],
  "expect": {
    "throws": "unknown key \"columns[0].typ\""
  }
}