[issue4357] frozen?set operations create incorrectly initialized instances of subclasses

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Well, this was changed only three days ago.
Please wait for the next 3.0rc3...

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nosy: +amaury.forgeotdarc

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