For example, apcu_store($this->getCacheKey($name), $definition, $this->cacheTTL);, and add a params on \DI\ContainerBuilder::enableDefinitionCache, like \DI\ContainerBuilder::enableDefinitionCache(string $cacheNamespace = '', int $cacheTTL = 0).

By default, apcu will store the cache util restart the vm. and if the developers want to control the real cache ttl, they can use $builder->enableDefinitionCache('', 60 * 60); to override it.