Guido van Rossum wrote:
> Stuff in sys that people don't use doesn't really confuse anyone IMO.
> 
> I really don't think that this warrants a new module.
> 
> Many of the datatype-related types (e.g. dict_keys) should not go
> there but in _collections anyway.

I really think we should postpone the decision until after the next
alpha. For now I like to commit the part of the patch that adds all
types to the appropriate header files. A lot of internal types aren't
available from other C files.

Christian