Message 278243 - Python tracker

fastfuture3-wip.patch is work in progress implementation of
implementing __repr__ and __del__ in C.
I post it to avoid duplicated works.

Known TODOs:

* Support overriding Future._repr_info()
* Fix __del__ is not called (Research how tp_del, tp_finalize, and tp_deallocate works)

I hope I have enough time to finish in next week, but I'm not sure.