if (stat_cache_max_entries_env &&
      absl::SimpleAtoi(stat_cache_max_entries_env, &value)) {
    stat_cache_max_entries = static_cast<size_t>(value);
  }
  stat_cache = std::make_unique<ExpiringLRUCache<GcsFileStat>>(
      stat_cache_max_age, stat_cache_max_entries);
}

GCSFile::GCSFile(google::cloud::storage::Client&& gcs_client, bool compose,