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Let there be rooms for each GC implementations how to handle multi threaded situations. They can be totally reentrant, or can have their own mutex, or can rely on rb_thread_call_with_gvl. In any ways the allocator (has been, but now officially is) expected to run properly without a GVL. This means there need be a way for them to inform the interpreter about their allocation failures, without relying on raising exceptions. Let them do so by returning NULL.