[issue42160] unnecessary overhead in tempfile

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

Oh, _RandomNameSequence is not true singleton. Instance is used in tests actually.
Using `os.register_at_fork` was but idea. Let's reject it.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42160>
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