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This time around, syncing typeshed was not easy. I had to push some changes to typeshed (python/typeshed#355) and then make some fixes to mypy itself (contained in this PR). Inspiration for all of this was #1841 but two out of three files changed there were taken care of more pleasantly than the changes there. Only the test_random.py change there (adding a
# type: ignore
) is still needed, due to #1846 -- I can't arrive at a simple but correct fix for the latter.