Run tests on win32 for mypy #3425
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We missed an issue in Windows (see #3424) because typeshed tests run only on Unix; it was caught in mypy tests because those also run on Windows. This PR makes the typeshed mypy test also run with
--platform win32
.I'm not quite sure this is worth it because it will double testing time and it's been very rare for a Windows-only mypy issue to get missed. We also have a handful of sys.platform checks for "darwin" in typeshed, so perhaps we should also add that to the tested platforms, but that would increase testing time even more.