[issue43308] subprocess.Popen leaks file descriptors opened for DEVNULL or PIPE stdin/stdout/stderr arguments

[Alexey Izbyshev]

Change by Alexey Izbyshev <izbyshev at ispras.ru>:


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nosy: +gregory.p.smith

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43308>
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