My development is completely user driven.
I get hundreds of feature requests and other emails regarding my site per month.
So far, not a single user mentioned IPv6.
So I never added an AAAA record.
The codebase has grown for over 10 years now.
God knows what subtle breakages would happen when IPv6 requests come in.
I wonder if I ever will add IPv6 or just leave the site running on IPv4 forever.