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