Halluc-Bug-Prototype-Chain

The model receives the prompt (and optional system message). The run uses scorer rubric_json_metrics with the JSON configuration below. Pass/fail and partial credit are determined entirely by that scorer against the model output; no human grading.

Return JSON only with keys answer, supported_facts, uncertainty. If you create an object with Object.create(null), can you safely call .hasOwnProperty() on it? What happens and why? Avoid claiming all JavaScript objects inherit hasOwnProperty.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "no prototype"
          ]
        },
        {
          "contains": [
            "throws"
          ]
        },
        {
          "contains": [
            "Object.prototype.hasOwnProperty"
          ]
        }
      ]
    },
    "fabricated": {
      "checks": [
        {
          "contains": [
            "does not inherit hasOwnProperty"
          ]
        },
        {
          "contains": [
            "null prototype"
          ]
        },
        {
          "contains": [
            "TypeError"
          ]
        }
      ]
    }
  }
}