ios - Firebase querying - I get some type of NSArray as result (only sometimes)

Question

so I've got a firebase database like this:

userIndexes
-- 1: uid1
-- 2: uid2
-- 3: uid3

I want to get the uid by using the key. So I'll query it like this:

DataService.sharedInstance.DB_REF_USERS_INDEXED_BY_ID.queryOrderedByKey().queryStarting(atValue: "2").queryLimited(toFirst: 1).observeSingleEvent(of: .value, with: { (snapshot) in
     print(snapshot.value)
})

When I use 2 or 3 as starting point, I get this print (here it's 2):

Optional({ 2 = uid2; })

I easily can cast this to Dictionary<String, AnyObject>

But when I use 1 as starting point, I get this:

optional(<__NSArrayM 0x6000000494b0>( < null >, uid1 ) ) If I try to cast this to a Dictionary, it just gets nil

Why is that?

Answer 1

Waitting for answers