[issue31486] calling a _json.Encoder object raises a SystemError in case obj.items() returned a tuple

[Serhiy Storchaka]

Change by Serhiy Storchaka <storchaka+cpython at gmail.com>:


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stage:  -> needs patch
versions: +Python 3.6 -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue31486>
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