docs: private void update(Collection<InternalSubscriptionInfo> subscriptions) {
      for (InternalSubscriptionInfo subscription : subscriptions) {
        InternalTopic topic = topics.computeIfAbsent(subscription.topic, InternalTopic::new);
        InternalSubscriptionInfo matchingSubscription = topic.remoteSubscriptions().stream()
            .filter(s -> s.memberId().equals(subscription.memberId()) && s.logicalTimestamp().equals(subscription.logicalTimestamp()))
            .findFirst()
            .orElse(null);
        if (matchingSubscription == null) {
          topic.addRemoteSubscription(subscription);
        } else if (subscription.isTombstone()) {
          topic.removeRemoteSubscription(subscription);
        }
      }
    }