And IPv6 vs v4 discussions are just like Python 3 vs. 2 discussions: Often much more annoying than just getting it over with and switching.
It would've been less annoying to not do a breaking change from Py2 to 3. JS never had a breaking change like that.
This. Sure there are still some applications that might be difficult to v6 enable, so either patch it or use one of the myriad of options to give it a v6 front end.