Context:
People have been asking for IPv6 Support on GitHub since years (probably a decade by now)
... and someone even got so annoyed that they decided to setup a dedicated website for checking this: https://isgithubipv6.live/
Yes just had a look, according to Google countrywide it's 10%. Very low, sadly. Neighboring France at 74% IPv6. Interesting to see the difference even with neighbouring countries.