public function updateSet($key, UpdateSet $builder)
    {
        $this->update($key, Riak\DataType\Set::TYPE, $builder);

        return $this;
    }
public function updateSet($key, UpdateSet $builder)
    {
        $this->update($key, Riak\DataType\Set::TYPE, $builder);

        return $this;
    }
@param $key
@param UpdateSet $builder

@return $this