cleanExpired method

void cleanExpired()

Clean expired entries

Implementation

void cleanExpired() {
  final expiredKeys = <String>[];
  for (final entry in _cache.entries) {
    if (entry.value.isExpired) {
      expiredKeys.add(entry.key);
    }
  }
  for (final key in expiredKeys) {
    _cache.remove(key);
    _accessFrequency.remove(key);
  }
}