If I make a AAAA record: AAAA("@","2001:0db8:85a3:0000:0000:8a2e:0370:7334"), I can create it in gcloud no problem.

I do always get a modification though: MODIFY AAAA example5555qwerty.com: (2001:db8:85a3::8a2e:370:7334 300) -> (2001:0db8:85a3:0000:0000:8a2e:0370:7334 300)

Because gcloud stores and returns it in the minified format. I propose as part of the validation/normalization phase, we minimize all ipv6 addresses. That will become our "standard" format. If any provider has issue with that, we will handle it in the provider itself.