[issue31406] crashes when comparing between a Decimal object and a bad Rational object

[Stefan Krah]

Stefan Krah added the comment:


New changeset 3cedf46cdbeefc019f4a672c1104f3d5e94712bd by Stefan Krah in branch 'master':
bpo-31406: Fix crash due to lack of type checking in subclassing. (#3477)
https://github.com/python/cpython/commit/3cedf46cdbeefc019f4a672c1104f3d5e94712bd


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<https://bugs.python.org/issue31406>
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