Litipk\BigNumbers\Decimal::sqrt PHP Method

    public function sqrt($scale = null)
    {
        if ($this->isNegative()) {
            throw new \DomainException("Decimal can't handle square roots of negative numbers (it's only for real numbers).");
        } elseif ($this->isZero()) {
            return DecimalConstants::Zero();
        }
        $sqrt_scale = $scale !== null ? $scale : $this->scale;
        return self::fromString(bcsqrt($this->value, $sqrt_scale + 1), $sqrt_scale);
    }