private function formatSiNumber($value, $decimals, $maxPosition, $options, $textOptions)
    {
        if (is_string($value) && is_numeric($value)) {
            $value = (int) $value;
        }
        if (!is_numeric($value)) {
            throw new InvalidParamException("'$value' is not a numeric value.");
        }
        $formatBase = 1000;

        $position = 0;
        do {
            if ($value < $formatBase) {
                break;
            }
            $value = $value / $formatBase;
            $position++;
        } while ($position < $maxPosition);

        // no decimals for base unit
        if ($position === 0) {
            $decimals = 0;
        } elseif ($decimals !== null) {
            $value = round($value, $decimals);
        }
        // disable grouping for edge cases like 1023 to get 1023 B instead of 1,023 B
        $oldThousandSeparator = $this->thousandSeparator;
        $this->thousandSeparator = '';
        if ($this->_intlLoaded) {
            $options[\NumberFormatter::GROUPING_USED] = false;
        }
        // format the size value
        $params = [
            // this is the unformatted number used for the plural rule
            'n' => $value,
            // this is the formatted number used for display
            'nFormatted' => $this->asDecimal($value, $decimals, $options, $textOptions),
        ];
        $this->thousandSeparator = $oldThousandSeparator;

        return [$params, $position];
    }