[issue43246] Dict copy optimization violates subclass invariant

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

I am not sure this should be fixed.

If so, I think we should use PyDict_CheckExact() instead of PyDict_Check() && (tp_iter is overridden || keys() is overridden || sq_item is overridden).

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nosy: +rhettinger

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<https://bugs.python.org/issue43246>
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