Mark,

thanks for the quick follow-up.
OK, i now understand the situation better. The documentation I had read 
originally didn't talk about special-casing built-in objects. (And since 
I want to extend a tuple, I do have to override __getslice__ since I 
want to make sure the returned object still has the derived type.)

Yes, I believe this issue can be closed as invalid.
(Though I believe the docs could be a bit more clear about this.)

Thanks,
		Stefan

-- 

       ...ich hab' noch einen Koffer in Berlin...