You can't enqueue a waiting request when using the max concurrency control!

[axpwx]

设置了retry_time和max_co的时候，触发重试会报错"You can't enqueue a waiting request when using the max concurrency control!".
最小化代码：

<?php
go(function() {
    $idList = [
        '1',
        '2',
        '3',
        '4',
        '5',
    ];
    foreach ($idList as $id) {
        $urls[] = [
          'uri' => 'https://domain/path/ . $id,
        ];
    }
    
    try {
        $responses = SaberGM::requests($urls, [
            'exception_report' => 0,
            'retry_time'       => 3,
            'max_co'           => 2
        ]);
    } catch (Exception $e) {
        echo $e->getMessage(); // You can't enqueue a waiting request when using the max concurrency control!
    }
});