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

[Rémi Lapeyre]

Change by Rémi Lapeyre <remi.lapeyre at henki.fr>:


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keywords: +patch
pull_requests: +7474
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue33927>
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