{
  "name": "edge/unknown-keys-ignored",
  "why": "§5 C: result rows are keyed by column key; input keys that are not columns are not part of the result",
  "rules": {
    "columns": [
      {
        "key": "v"
      }
    ]
  },
  "rows": [
    {
      "v": "a",
      "extra": "b"
    }
  ],
  "expect": {
    "ok": true,
    "errors": [],
    "warnings": [],
    "rows": [
      {
        "$row": 2,
        "v": "a"
      }
    ]
  }
}