gh-142781: Fix type confusion in zoneinfo weak cache #142925
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Validate the types returned from _weak_cache.get() and _weak_cache.setdefault() to prevent type confusion when a ZoneInfo subclass provides a misbehaving cache implementation.
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Validate the types returned from
_weak_cache.get()and_weak_cache.setdefault()to prevent type confusion when a ZoneInfo subclass provides a misbehaving cache implementation.Fixes gh-142781.