[issue17421] Drop restriction that meta.__prepare__() must return a dict (subclass)

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

> Are you sure that non-dicts work fine?

They don't. See issue31588.

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dependencies: +SystemError in class creation in case of a metaclass with a bad __prepare__() method
nosy: +serhiy.storchaka

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue17421>
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