{
  "expression": [
    "coalesce",
    ["number", ["get", "x"]],
    ["number", ["get", "y"]],
    ["number", ["get", "z"]]
  ],
  "inputs": [
    [{}, {"properties": {"x": 1}}],
    [{}, {"properties": {"x": 1, "y": 2, "z": 3}}],
    [{}, {"properties": {"y": 2}}],
    [{}, {"properties": {"z": 3}}],
    [{}, {}]
  ],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "number"
    },
    "outputs": [
      1,
      1,
      {"error": "Expected value to be of type number, but found null instead."},
      {"error": "Expected value to be of type number, but found null instead."},
      {"error": "Expected value to be of type number, but found null instead."}
    ],
    "serialized": [
      "coalesce",
      ["number", ["get", "x"]],
      ["number", ["get", "y"]],
      ["number", ["get", "z"]]
    ]
  }
}