[immibis]

One of the things on my cool ideas list is AF_ONION. getaddrinfo should be able to translate a .onion DNS name into an AF_ONION address immediately, and then you should be able to open an AF_ONION socket to that address. Tor would instantly be compatible with every program that doesn't assume IPv4/6 (which is shockingly few, but automatic Tor support would be a good reason to fix that). Same with I2P.

Prior to that, .onion blocking in getaddrinfo would also make sense - it would apply to a large swath of apps - and could be overridden with nsswitch.conf, perhaps.

Props to Daniel for recognizing that the situation is impossible to solve in a way that pleases everyone. Some people would just change it to meet the demands of the last person who asked, without thinking deeper.