GitHub and Microsoft Azure still aren't IPv6-ready.
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The Portal now loads for me on IPv6, which then blocks me from accessing certain PaaS resources because they only work with IPv4 rules in their firewalls.
Speaking of which, it grinds me gears that every Azure PaaS service implements firewall rules in a unique and special way. The syntax is different, the parameters are different, the capabilities are different, and the output logs are also incompatible just for extra fun.