I think this is a terrible idea. Implementers of Python should code to a unified Python standard, instead of asking programmers of Python to code to a disparate collection of implementations.
This doesn't seem to me to be the goal. I think the point is that implementers would produce this module, and stdlib developers would consume it. Joe Foobar python programmer should never need to know about it.
I think it's maybe not the best solution, but it's good, and the fact that they're trying to address the problem somehow is great.
