public function formatDecimal($number, array $attributes = [], array $textAttributes = [], $locale = null)
    {
        $methodArgs = array_pad(\func_get_args(), 5, null);

        list($locale, $symbols) = $this->normalizeMethodSignature($methodArgs[3], $methodArgs[4]);

        return $this->format($number, \NumberFormatter::DECIMAL, $attributes, $textAttributes, $symbols, $locale);
    }