{
  "context": "This criteria evaluates how well the engineer uses @formatjs/intl-localematcher to implement a locale fallback resolver with progressive subtag removal. The focus is on proper use of the package's BestAvailableLocale algorithm and related locale matching capabilities.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "Package Import",
      "description": "Correctly imports necessary functions or classes from @formatjs/intl-localematcher package (e.g., match, LookupMatcher, or internal utilities)",
      "max_score": 15
    },
    {
      "name": "Locale Matching Usage",
      "description": "Uses the package's locale matching functionality (such as match() with 'lookup' algorithm or LookupSupportedLocales()) rather than implementing matching logic from scratch",
      "max_score": 30
    },
    {
      "name": "Progressive Fallback",
      "description": "Implements or leverages the progressive subtag removal algorithm correctly (right-to-left removal: en-Latn-US → en-Latn → en)",
      "max_score": 25
    },
    {
      "name": "Efficient Lookups",
      "description": "Uses Set-based or efficient data structures for available locales checking, consistent with package's O(1) lookup approach",
      "max_score": 15
    },
    {
      "name": "Test Compliance",
      "description": "Implementation passes all 5 test cases specified in the problem (exact match, progressive fallback, no match scenario)",
      "max_score": 15
    }
  ]
}