CloudKit watchOS 5.1 to 5.2 API Differences

CKAsset.h
Modified CKAsset.fileURL
Declaration
From@property (nonatomic, readonly, copy, nonnull) NSURL *fileURL
To@property (nonatomic, readonly, copy, nullable) NSURL *fileURL

CKNotification.h
Modified +[CKNotification notificationFromRemoteNotificationDictionary:]
Declaration
From+ (nonnull instancetype)notificationFromRemoteNotificationDictionary:(nonnull NSDictionary *)notificationDictionary
To+ (nullable instancetype)notificationFromRemoteNotificationDictionary:(nonnull NSDictionary *)notificationDictionary