{
  "context": "This criteria evaluates how well the engineer uses the jsons package to serialize and deserialize a defaultdict with proper type hints, preserving the default_factory behavior for automatic list initialization.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "DefaultDict Usage",
      "description": "Uses collections.defaultdict with list as the default_factory to store student grades",
      "max_score": 20
    },
    {
      "name": "Type Hint",
      "description": "Uses typing.DefaultDict[str, List[float]] or DefaultDict[str, list[float]] type hint for the grades data structure",
      "max_score": 20
    },
    {
      "name": "Serialization",
      "description": "Uses jsons.dump() or jsons.dumps() to serialize the defaultdict in the to_json method",
      "max_score": 15
    },
    {
      "name": "Deserialization",
      "description": "Uses jsons.load() or jsons.loads() with the DefaultDict type hint to deserialize in the from_json method",
      "max_score": 20
    },
    {
      "name": "Type Preservation",
      "description": "Passes the correct type (DefaultDict[str, List[float]] or similar) as the cls parameter to jsons.load/loads to preserve the default_factory",
      "max_score": 15
    },
    {
      "name": "Functional Correctness",
      "description": "All test cases pass: automatic initialization works both before and after deserialization",
      "max_score": 10
    }
  ]
}