{
  "expression": ["index-of", ["get", "i"], ["get", "arr"]],
  "inputs": [
    [{}, {"properties": {"i": null, "arr": [9, 8, 7]}}],
    [{}, {"properties": {"i": 1, "arr": [9, 8, 7]}}],
    [{}, {"properties": {"i": 9, "arr": [9, 8, 7]}}],
    [
      {},
      {
        "properties": {
          "i": "foo",
          "arr": ["baz", "bar", "hello", "foo", "world"]
        }
      }
    ],
    [
      {},
      {
        "properties": {
          "i": true,
          "arr": ["foo", 123, null, 456, false, {}, true]
        }
      }
    ],
    [{}, {"properties": {"i": 1, "arr": null}}]
  ],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "number"
    },
    "serialized": ["index-of", ["get", "i"], ["get", "arr"]],
    "outputs": [
      -1,
      -1,
      0,
      3,
      6,
      {
        "error": "Expected second argument to be of type array or string, but found null instead."
      }
    ]
  }
}