Give the dictionary of recorders detached from the existing instances.
        It is safe to store those references for future use. Used by feattool.

def snapshot_registry(self):
        '''
        Give the dictionary of recorders detached from the existing instances.
        It is safe to store those references for future use. Used by feattool.
        '''
        unserializer = banana.Unserializer(externalizer=self)
        serializer = banana.Serializer(externalizer=self)
        return unserializer.convert(serializer.convert(self.registry))