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I was also interested to know how this was handled for IPv6, but it was only briefly mentioned.

Probably they didn't need to do much work with IPv6, since half of the post is solving IPv4 exhaustion problems.

Cloudflare wants to make money. The IPv6 features can come second as v6 usage increases.

All of Cloudflare services ship with IPv6 day 1. IPv6 not an issue as we have enough IPv6 for each machine to have own IPs.