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@Eric, given the breadth of change introduced in the PR (including adding a new extension), I think it would be best if at all possible to get it in for beta 1 if we can resolve the review comments in time. If necessary and if there are no objections from other core developers, I would be willing to consider making an exception and allowing it into beta 2 as long as it remains a private interface. If it looks like it won't be in releasable shape by then, I think you should hold off for 3.8; doing otherwise would be unfair to others and to our downstream beta users / testers, for example, even if it is private, adding a new extension and setup.py changes potentially affect downstream packagers.