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