* Creates a duplicate-free version of an array, using * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero) * for equality comparisons, in which only the first occurence of each element * is kept. Providing `true` for `isSorted` performs a fast
(array, isSorted, iteratee, thisArg)
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