{
  "expression": ["has", "x"],
  "inputs": [
    [{}, {}],
    [{}, {"properties": {"x": 1}}],
    [{}, {"properties": {"x": 0}}],
    [{}, {"properties": {"x": false}}],
    [{}, {"properties": {"x": null}}]
  ],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "boolean"
    },
    "outputs": [false, true, true, true, true],
    "serialized": ["has", "x"]
  }
}