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

[Luna Chen]

Luna Chen <luna at bnmetrics.com> added the comment:

Hi Pekka Klärck, I would like to work on this issue and make a PR if you haven't done it yet. 

Thanks!:)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34805>
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