Can we consider using asynchronous getaddrinfo_a?

[x152152]

Under certain network anomalies, getaddrinfo may be blocked. Could you please tell me why the getaddrinfo_a related code is commented out? I am interested in exploring this. Thank you!

[icraggs]

As the comment says, it caused errors when running the CI tests which I wasn't able to determine the cause of.

In any case, there would be other changes needed, possibly quite extensive, to make this work. There is an issue for the enhancement #690.