anchor.diff:    }
   }
   
  -class _InstanceWrapper {
  -  _InstanceWrapper(this.instance, this.isNew);
  +class ManagedInstanceWrapper {
  +  ManagedInstanceWrapper(this.instance, this.isNew);
   
     bool isNew;
     ManagedObject instance;
  
positive.code:     return returnMap;
    }
  
    _InstanceWrapper instanceFromRow(Iterator<dynamic> rowIterator, Iterator<PropertyToColumnMapper> mappingIterator, {ManagedEntity entity}) {
      entity ??= rootEntity;
  
      // Inspect the primary key first.  We are guaranteed to have the primary key come first in any rowIterator.
  
negative.code:       }
      }
  
      return new ManagedInstanceWrapper(instance, !alreadyExists);
    }
  
    List<ManagedObject> instancesForRows(List<List<dynamic>> rows) {
  