{
  "expression": [
    "number",
    ["at", ["number", ["get", "i"]], ["array", ["get", "arr"]]]
  ],
  "inputs": [
    [{}, {"properties": {"i": 1, "arr": [9, 8, 7]}}],
    [{}, {"properties": {"i": -1, "arr": [9, 8, 7]}}],
    [{}, {"properties": {"i": 4, "arr": [9, 8, 7]}}],
    [{}, {"properties": {"i": 1.5, "arr": [9, 8, 7]}}]
  ],
  "expected": {
    "compiled": {
      "result": "success",
      "isFeatureConstant": false,
      "isZoomConstant": true,
      "type": "number"
    },
    "outputs": [
      8,
      {"error": "Array index out of bounds: -1 < 0."},
      {"error": "Array index out of bounds: 4 > 2."},
      {"error": "Array index must be an integer, but found 1.5 instead."}
    ],
    "serialized": [
      "number",
      ["at", ["number", ["get", "i"]], ["array", ["get", "arr"]]]
    ]
  }
}