The keys of `contexts` are same, its `root` that differs. It starts with `c:/` on Py3.7 but `C:/` on Py3.8.
Bug 1628726 Comment 6 Edit History
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The keys of `contexts` are same, its `root` that differs. It starts with `c:/` on Py3.7 but `C:/` on Py3.8. (And `posixpath.normpath` does nothing with it.)