CloudKit macOS 10.13 Beta 1 to Beta 2 API Differences

CKOperation.h
Modified CKOperation.configuration
Declaration
From@property (nonatomic, copy, nullable) CKOperationConfiguration *configuration
To@property (nonatomic, copy, null_resettable) CKOperationConfiguration *configuration

CKOperationGroup.h
Modified CKOperationGroup.defaultConfiguration
Declaration
From@property (atomic, copy, nullable) CKOperationConfiguration *defaultConfiguration
To@property (atomic, copy, null_resettable) CKOperationConfiguration *defaultConfiguration