{
    "expression": ["index-of", ["get", "i"], ["array", ["get", "arr"]]],
    "inputs": [
      [{}, {"properties": {"i": null, "arr": [9, 8, 7]}}],
      [{}, {"properties": {"i": null, "arr": [9, 8, 7, null]}}],
      [{}, {"properties": {"i": 1, "arr": [9, 8, 7]}}],
      [{}, {"properties": {"i": 9, "arr": [9, 8, 7, 9]}}],
      [{}, {"properties": {"i": 1, "arr": null}}]
    ],
    "expected": {
      "compiled": {
        "result": "success",
        "isFeatureConstant": false,
        "isZoomConstant": true,
        "type": "number"
      },
      "serialized": ["index-of", ["get", "i"], ["array", ["get", "arr"]]],
      "outputs": [
        -1,
        3,
        -1,
        0,
        {"error": "Expected value to be of type array, but found null instead."}
      ]
    }
  }