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Even though we stub_const for our classes (so they go away) It isn't for a number of gc cycles until it will get cleared up
in the meantime, it will be returned from Class#subclasses
Solution: punt. let it return from subclasses.
But put a more robust implementation into our temporary ExtManagementSystem So they behave properly and don't freak out the blacklist specs
Fixes #23152
reproducer: