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No modern is allows any user space program to use adresses longer than 48 bit, and once you pack short strings in tagged NaN, you can also add alignement contraints for string buffers, and all other pointers needed for complexe types like table, and so allow adding 2bits for handles/objectids, leaning that you can use a giant user space with 50-bit pointers... In practice, this limit will not be reached at all.