MapLibreParticleLab/metrics/integration/expression-tests/collator/non-object-error/test.json

{
  "expression": ["==", "foo", "bar", ["collator", ["subexpression"]]],
  "expected": {
    "compiled": {
      "result": "error",
      "errors": [
        {"key": "[3]", "error": "Collator options argument must be an object."}
      ]
    }
  }
}