{
  "context": "Tests whether the response implements a correct type-safe generic groupBy function in TypeScript.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Correct generic signature",
      "description": "Function signature uses generics with K extends keyof T constraint to restrict the key parameter",
      "max_score": 15
    },
    {
      "name": "Correct grouping logic",
      "description": "Implementation correctly groups items into a Record/object where each key maps to an array of matching items",
      "max_score": 12
    },
    {
      "name": "Handles key value to string conversion",
      "description": "Converts the key's value to a string for use as Record key (via String() or template literal)",
      "max_score": 8
    },
    {
      "name": "Includes usage example",
      "description": "Shows example usage with the specified type and demonstrates that invalid keys cause compile errors",
      "max_score": 10
    },
    {
      "name": "No incorrect information",
      "description": "TypeScript code compiles correctly with strict mode and generic constraints are properly applied",
      "max_score": 12
    }
  ]
}