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

[Guido van Rossum]

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

Since this is how it works since 3.6, I think it's reasonable to make this part of the spec. For dictionary order we waited a release between implementing it that way and making it part of the spec; effectively we've already waited two releases (3.6 and 3.7) for this. So I say let's do it. This isn't something that's PEP-worthy anyway.

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nosy: +gvanrossum

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