[issue35803] Test and document that `dir=...` in tempfile may be PathLike

[Zachary Ware]

Change by Zachary Ware <zachary.ware at gmail.com>:


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resolution:  -> fixed
stage: patch review -> resolved
status: open -> closed
versions: +Python 3.7, Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue35803>
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