Improvement needed in documentation: what are the possible keys for getUnreadItemCount function "keys" argument

I’m trying to find a way to get the invitation count.
The following method seems to give that possibility.
Unfortunately, it expects a “keys” argument which is typed as an array of string but I can’t find what are the possible values. Could someone help me?

getUnreadItemCount(keys, callbackopt) → {Promise|undefined}

Get count of unread messages and invitations in super and non-super channels

Name Type
keys Array.
callback commonCallback

Ok, I’ve found it. It’s UnreadItemKey and It’s documented too.

May I suggest to link to it directly in the documentation to prevent the need to search manually for the correct definition?

Would be a nice improvement for the documentation