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f4a4e2afec
When a heap was released at the same time as the last resource on that heap, it was possible for both to see each other's refcount/resource_count as 0 and both would try to destroy the heap. Avoid that by converting "resource_count" to an internal refcount, which holds an extra +1 if the main refcount is nonzero. The final release will then be synchronized between the two since both will operate on "internal_refcount".