How to fetchChanges from iCloud?
My app have a local cache, I want to fetch changes from where it last interacted with iCloud.
1). use a predicate using own condition like id or date field in the data type? (id > maxId)
2). use the apple changedToken by saving it on disk every time after fetchChagnes completed?
what is the changeToken dataType here?
let changeToken = … // Read change token from disk
