docs: def prefetchDeclarativeIds(self, Declarative, count) -> DelcarativeIdGen:
          """ Prefetch Declarative IDs
  
          This function prefetches a chunk of IDs from a database sequence.
          Doing this allows us to preallocate the IDs before an insert, which significantly
          speeds up :
  
          * Orm inserts, especially those using inheritance
          * When we need the ID to assign it to a related object that we're also inserting.
  
          :param Declarative: The SQLAlchemy declarative class.
              (The class that inherits from DeclarativeBase)
  
          :param count: The number of IDs to prefetch
  
          :return: An iterable that dispenses the new IDs
          """
          return _commonPrefetchDeclarativeIds(
              self.dbEngine, self._sequenceMutex, Declarative, count
          )