docs: def register_serializers(self, serializers):
          """
          Adds extra serializers; generally registered during the handler lifecycle
          """
          for new_serializer in serializers:
  
              if not isinstance(new_serializer, serializer.Base):
                  msg = "registered serializer %s.%s does not inherit from prestans.serializer.Serializer" % (
                      new_serializer.__module__,
                      new_serializer.__class__.__name__
                  )
                  raise TypeError(msg)
  
          self._serializers = self._serializers + serializers