     /**
      Passes the handle to the deleted notification delegates.
      - Parameter set: A Set of NSManagedObjects to pass.
+     - Parameter source: A GraphSource value.
      */
     private func delegateToDeletedWatchers(_ set: Set<AnyHashable>, source: GraphSource) {
         let nodes = sortToArray(set)

    /**
     Passes the handle to the updated notification delegates.
     - Parameter set: A Set of NSManagedObjects to pass.
     */
    private func delegateToUpdatedWatchers(_ set: Set<AnyHashable>, source: GraphSource) {
        let nodes = sortToArray(set)

    /**
     Passes the handle to the inserted notification delegates.
     - Parameter set: A Set of NSManagedObjects to pass.
     - Parameter source: A GraphSource value.
     */
    private func delegateToInsertedWatchers(_ set: Set<AnyHashable>, source: GraphSource) {
        let nodes = sortToArray(set)
