public function roundDown(int $precision = 0): Utility
    {
        return $this->round($this->number, $precision, PHP_ROUND_HALF_DOWN);
    }
public function roundDown(int $precision = 0): Utility
    {
        return $this->round($this->number, $precision, PHP_ROUND_HALF_DOWN);
    }
public function roundDown ( int $ precision = 0 ) : Utility { return $ this -> round ( $ this -> number , $ precision , PHP_ROUND_HALF_DOWN ) ; }
Round down the number

@param int $precision

@return Utility
@throws InvalidNumberException
@throws NonNumericValueException
Round down the number