operator []= method
Implementation
@override
void operator []=(K key, CacheEntry<K, V> value) {
CacheEntry<K, V>? oldEntry = _internalMap[key];
if (oldEntry != null && oldEntry.value != null && onEvict != null) {
onEvict!(oldEntry.key, oldEntry.value!);
}
_internalMap[key] = value;
}