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glibc's `uintptr_t` and `uint64_t` are both `unsigned long int`, but `uint32_t` is `unsigned int`, so BitVector overloads cannot be resoled on 32-bit platforms by following compilation error: error: call to member function 'add' is ambiguous bv.add(heap_object_abi::SwiftSpareBitsMask); darwin 32-bit platforms use stdint types defined in SwiftStdint.h, so they are identical