{
  "expression": ["pi"],
  "inputs": [[{}, {}]],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": true,
      "isZoomConstant": true,
      "type": "number"
    },
    "outputs": [3.14159],
    "serialized": 3.141592653589793
  }
}