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Uploaded new bootstrapping patch that handles the fully explicit import machinery.
I also tweaked a couple of things so it plays nicely in terms of building an initial version with the checked in importlib.h. Specifically: pythonrun still calls _frozen_importlib._install and can tolerate that function returning None. Longer term, we'd give the two hooks different names and returning None will become a fatal error, but for the moment, the current behaviour makes the patch much easier to work with.
Order is still wrong relative to the zipimport machinery and I haven't benchmarked the startup time overheads.