perf: Avoid sorting and deduplicating in Node.flatten #31
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With `Vec` in place, flattening takes a merge sort, which is `O(n*log(n))`. Then, an additional pass to deduplicate O(n) is required. This can be avoided by using a HashSet, which is guaranteed to be O(1) on insert. Also, a HashSet doesn't need any intermediate memory allocations.
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With
Vecin place, flattening takes a merge sort, which isO(n*log(n)). Then, an additional pass to deduplicate O(n) is required. This can be avoided by using a HashSet, which is guaranteed to be O(1) on insert. Also, a HashSet doesn't need any intermediate memory allocations.