[issue40489] INCREF/DECREFs around the rich comparison needs tests

[Dong-hee Na]

Dong-hee Na <donghee.na92 at gmail.com> added the comment:

I can crash python interpreter with few lines of code when if we remove those codes.



class S(str):

    def __eq__(self, other):
        d.clear()
        return NotImplemented

    def __hash__(self):
        return hash('test')

d = {S(): 'value'}
'test' in d

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nosy: +corona10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue40489>
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