### What?
When read access is restricted on the `users` collection - restricted
users would not have access to other users complete user data object
only their IDs when accessing `user.value`.
### Why?
This is problematic when determining the lock status of a document from
a restricted users perspective as `user.id` would not exist - the user
data would not be an object in this case but instead a `string` or
`number` value for user ID
### How?
This PR properly handles both cases now and checks if the incoming user
data is an object or just a `string` / `number`.
55ce8e68fc