[issue33927] Allow json.tool to have identical infile and outfile

[Rémi Lapeyre]

Rémi Lapeyre <remi.lapeyre at henki.fr> added the comment:

Hi Pablo, I added two tests to confirm that file descriptors do not link anymore.

The tests are rather ugly but I'm not sure if it's possible to do better.

Is this patch ok for you?

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<https://bugs.python.org/issue33927>
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