{
  "context": "This criteria evaluates how effectively the engineer uses the w3lib package's safe_url_string function to sanitize and normalize URLs. The focus is on proper utilization of w3lib's URL safety features rather than implementing custom URL validation or encoding logic.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Uses safe_url_string",
      "description": "Implementation imports and uses the safe_url_string function from w3lib.url module",
      "max_score": 40
    },
    {
      "name": "Proper error handling",
      "description": "Returns None for invalid inputs (non-strings or malformed URLs) by checking the input type or catching exceptions from safe_url_string",
      "max_score": 20
    },
    {
      "name": "Handles special characters",
      "description": "Correctly handles URLs with special characters in the path (spaces, non-ASCII) by allowing safe_url_string to perform encoding",
      "max_score": 15
    },
    {
      "name": "Supports IDNA",
      "description": "Correctly handles internationalized domain names by relying on safe_url_string's built-in IDNA support",
      "max_score": 15
    },
    {
      "name": "Handles encoding normalization",
      "description": "Correctly handles mixed or incorrect encoding in URL components by using safe_url_string's normalization capabilities",
      "max_score": 10
    }
  ]
}