[issue34805] Explicitly specify `MyClass.__subclasses__()` returns classes in definition order

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

Josh, I have to ask -- do you have plans to rewrite the __subclasses__
implementation? Because at this point I don't really feel like arguing over
the OP's use case. It looks like you have a strong objection over the
requested feature that's quite independent from the validity of any use
cases, and I'm curious why. The argument "but then we couldn't change the
implementation in some future version" feels pretty weak.

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