Even the blog admits that cancellation of any kind, is racing with the kernel which might complete the accept request anyway. Even if you call `.cancel()`, the queue might have an accepted connection FD in it. Even if it doesn't, it might do by the time the kernel acknowledges the cancellation.

So you now have a mistakenly-accepted connection. What do you do with it? Drop it? That seems like the wrong answer, whoever writes a loop like the one in the blog will definitely not expect some of the connections mysteriously being dropped.