Function unique

unique<T>(xs: readonly T[]): T[]
Drop duplicates using SameValueZero equality (so NaN equals NaN and +0 equals -0). First occurrence wins; order preserved.
Type Parameters
- T
Parameters
- xs: readonly T[]
Returns T[]
Example
```
unique([1, 2, 2, 3, 1])
  // [1, 2, 3]
```
- Defined in arrays/unique.ts:9