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That's an excellent question and this opens the door to another another interesting discussion. I don't have the energy for that unfortunately, but to reply to your comment: it's not really important that it succeeds per se. Drastically increasing the likelihood of an error is good enough. What's important is that it mitigates the chances of introducing a bug silently.

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There’s no error in the original example; in Python, the ability to participate in inheritance diamonds with arbitrary other classes is a feature which must be explicitly documented and maintained. James Knight wrote a really good piece on this many years ago: https://fuhm.net/super-harmful/

The solution is just to avoid inheritance. It’s full of terrible pitfalls in most languages, but Python more than most.

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