{
    "expression": ["slice", ["get", "val"], ["get", "index"]],
    "inputs": [
      [{}, {"properties": {"val": "0123456789", "index": 0}}],
      [{}, {"properties": {"val": "0123456789", "index": 4}}],
      [{}, {"properties": {"val": "0123456789", "index": 99}}],
      [{}, {"properties": {"val": "0123456789", "index": -2}}]
    ],
    "expected": {
      "serialized": ["slice", ["get", "val"], ["get", "index"]],
      "compiled": {
        "result": "success",
        "isFeatureConstant": false,
        "isZoomConstant": true,
        "type": "value"
      },
      "outputs": ["0123456789", "456789", "", "89"]
    }
  }