Debug-Array-Sort-Mutation-V2

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 diagnosis, fix, tests. A helper sorts an input array in place before returning top scores, causing callers to observe reordered data. Identify the mutation and fix it.

{
  "metrics": {
    "repro": {
      "checks": [
        {
          "contains": [
            "input array"
          ]
        },
        {
          "contains": [
            "reordered"
          ]
        },
        {
          "contains": [
            "sort"
          ]
        },
        {
          "contains": [
            "caller"
          ]
        }
      ]
    },
    "hidden": {
      "checks": [
        {
          "contains": [
            "copy"
          ]
        },
        {
          "contains": [
            "toSorted"
          ]
        },
        {
          "contains": [
            "slice"
          ]
        }
      ]
    },
    "diagnose": {
      "checks": [
        {
          "contains": [
            "in place"
          ]
        },
        {
          "contains": [
            "mutation"
          ]
        },
        {
          "contains": [
            "top scores"
          ]
        }
      ]
    }
  }
}