Firebase Messaging should have a method to check notification permissions

[komape]

As written in this documentation Firebase Messaging is supposed to have the following method:

NotificationSettings settings = await FirebaseMessaging.instance.getNotificationSettings();

But it does not. I have version 7.0.3 installed which is the most current version to my knowledge. Am I missing something? If not please add it again. I don't want to have an extra package just to check notification permissions and this should just be included into a package about notifications.

What also occurs strange to me is that I get the Firebase Messaging instance by invoking FirebaseMessaging().