{
  "expression": [
    "format",
    ["get", "a"],
    {},
    ["get", "1"],
    {},
    ["get", "true"],
    {}
  ],
  "inputs": [[{}, {"properties": {"a": "a", "1": 1, "true": true}}]],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "formatted"
    },
    "outputs": [
      {
        "sections": [
          {
            "text": "a",
            "image": null,
            "scale": null,
            "fontStack": null,
            "textColor": null
          },
          {
            "text": "1",
            "image": null,
            "scale": null,
            "fontStack": null,
            "textColor": null
          },
          {
            "text": "true",
            "image": null,
            "scale": null,
            "fontStack": null,
            "textColor": null
          }
        ]
      }
    ],
    "serialized": [
      "format",
      ["get", "a"],
      {},
      ["get", "1"],
      {},
      ["get", "true"],
      {}
    ]
  }
}