MapLibreParticleLab/metrics/integration/expression-tests/equal/mismatch/test.json

{
  "expression": ["==", ["string", ["get", "x"]], ["number", ["get", "y"]]],
  "expected": {
    "compiled": {
      "result": "error",
      "errors": [
        {"key": "", "error": "Cannot compare types 'string' and 'number'."}
      ]
    }
  }
}