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350c58ba4e
Fix a bug caused by the garbage collector clearing weakrefs too early. The weakrefs in the ``tp_subclasses`` dictionary are needed in order to correctly invalidate type caches (for example, by calling ``PyType_Modified()``). Clearing weakrefs before calling finalizers causes the caches to not be correctly invalidated. That can cause crashes since the caches can refer to invalid objects. Defer the clearing of weakrefs without callbacks until after finalizers are executed.
CPython Internals Documentation
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