MapLibreParticleLab/metrics/integration/expression-tests/format/implicit-assert/test.json

{
  "expression": ["number", ["get", "p"]],
  "propertySpec": {
    "type": "formatted"
  },
  "expected": {
    "compiled": {
        "result": "error",
        "errors": [
          {"key": "", "error": "Expected formatted but found number instead."}
        ]
    }
  }
}