RateLimitExceededException issue

[gitstashgithub]

Hi guys,

In src/XeroPHP/Remote/Exception/RateLimitExceededException.php file createFromHeaders() function,

    public static function createFromHeaders($headers)
    {
        $headers = array_change_key_case($headers, CASE_LOWER);

        $problem = isset($headers['x-rate-limit-problem']) ? current($headers['x-rate-limit-problem']) : null;
        $retryAfter = isset($headers['retry-after']) ? current($headers['retry-after']) : null;

        $exception = new self();
        $exception->setRateLimitProblem($problem);
        $exception->setRetryAfter($retryAfter);

        return $exception;
    }

I don't understand why the current() function is being used to get $headers['x-rate-limit-problem'] value. Is it supposed to be an array or object? I thought it's a string value like Day or Minute. Thank you.