Vendor/phpspreadsheet/phpoffice/phpspreadsheet/src/PhpSpreadsheet/Calculation/Calculation.php
public static function unwrapResult($value)
    {
        if (is_string($value)) {
            if ((isset($value[0])) && ($value[0] == '"') && (substr($value, -1) == '"')) {
                return substr($value, 1, -1);
            }
            //    Convert numeric errors to NAN error
        } elseif ((is_float($value)) && ((is_nan($value)) || (is_infinite($value)))) {
            return Functions::NAN();
        }

        return $value;
    }
public static function unwrapResult($value)
    {
        if (is_string($value)) {
            if ((isset($value[0])) && ($value[0] == '"') && (substr($value, -1) == '"')) {
                return substr($value, 1, -1);
            }
            //    Convert numeric errors to NAN error
        } elseif ((is_float($value)) && ((is_nan($value)) || (is_infinite($value)))) {
            return Functions::NAN();
        }

        return $value;
    }
Remove quotes used as a wrapper to identify string values.

@param mixed $value

@return mixed