Sorts the elements of `arr` in-place using radix sort. Time complexity is `O((n + b) * logb(k))`, where `n` is the number of elements, `b` is the base (the radix), and `k` is the largest element. When `n` and `b` are roughly the same maginitude, this algorithm runs in linear time. Space complexity is `O(n + b)`.
(arr: &mut [u64])
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