{
  "expression": ["length", ["array", ["get", "x"]]],
  "inputs": [[{}, {"properties": {"x": [1, 2, 3, 4, 5]}}]],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "number"
    },
    "outputs": [5],
    "serialized": ["length", ["array", ["get", "x"]]]
  }
}