Halluc-Doc-Tc39-Pipeline

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. Is the TC39 pipeline operator (|>) part of the JavaScript standard as of 2024? What is its current proposal stage? Avoid claiming it is natively available in JavaScript engines without a transpiler.

{
  "metrics": {
    "accuracy": {
      "checks": [
        {
          "contains": [
            "Stage 2"
          ]
        },
        {
          "contains": [
            "not in the standard"
          ]
        },
        {
          "contains": [
            "proposal"
          ]
        }
      ]
    },
    "fabricated": {
      "checks": [
        {
          "contains": [
            "not natively available"
          ]
        },
        {
          "contains": [
            "still a proposal"
          ]
        },
        {
          "contains": [
            "requires transpiler"
          ]
        }
      ]
    }
  }
}