Like IPv6 addresses, UUIDs, the list goes on. Does it mean anything that Go themselves had to invent a custom uint128 type in the standard library because they didn't want to add it to the language? There's a very long list of instances of them stonewalling it here: https://github.com/golang/go/issues/9455
I agree with their reasoning, you don’t typically do math with a UUID, 128 bit cryptographic hashes are insecure and outdated anyway, and IPv6 is kinda valid but rare and still doable with slices.