src/Primitive/Container/Container.php
public function unique($recursive = false)
    {
        if ($this->getBoolable($recursive))
        {
            return new static($this->uniqueRecursive($this->items));
        }

        return new static(array_unique($this->items));
    }
public function unique($recursive = false)
    {
        if ($this->getBoolable($recursive))
        {
            return new static($this->uniqueRecursive($this->items));
        }

        return new static(array_unique($this->items));
    }
Unique Container items.

@param bool|BooleanContract $recursive
@return $this