evict method
Implementation
@override
void evict() {
final keys = _cachedDataMap.keys.toList();
keys.forEach((key) {
final data = _cachedDataMap[key]!;
final diff = DateTime.now().millisecondsSinceEpoch - data.ts;
if (data.isRemoved && diff > 180) _cachedDataMap.remove(key);
});
}