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The thread_local storage class was not available pre-C++11. Even when C++11 was available, the C++ runtime in versions of iOS <= 9.0 was not capable of supporting this storage class. So we ended up using pthread directly in that case. The unique pointer support was added later. Now that the storage class has been supported on all Flutter platforms for a while, we can remove the fallback and remove a bunch of code. The ThreadLocalUniquePtr can be removed too but that can be attempted in a separate migration.