{
  "expression": ["number", ["get", "x"]],
  "inputs": [[{}, {}], [{}, {"properties": {"x": 1}}]],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "number"
    },
    "outputs": [
      {"error": "Expected value to be of type number, but found null instead."},
      1
    ],
    "serialized": ["number", ["get", "x"]]
  }
}