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Same as https://github.com/jonschlinkert/array-unique/blob/master/benchmark/code/while.js, but preserves the order of elements in result array, which is nice to have.
Performance is almost as good as while.js
BTW, is there any reason the implementation in https://github.com/jonschlinkert/array-unique/blob/master/index.js is not from https://github.com/jonschlinkert/array-unique/blob/master/benchmark/code/while.js ?
For me on node 0.12.0 array-uniq with Set is the fastest on arrays bigger than 1000 elements. In all other cases https://github.com/jonschlinkert/array-unique/blob/master/benchmark/code/while.js is the fastest.