Message 343000 - Python tracker

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Content
I wrote PR 13458 to revert the change which broke the CI for longer than one week, see the rationale there:
https://github.com/python/cpython/pull/13458#issuecomment-494334241

Email thread about the regression:
https://mail.python.org/pipermail/python-buildbots/2019-May/000280.html