[IshKebab]

NPM is the same. You might think that all of the packages are stored on NPM servers. Mostly true, but still when you install some of them they'll download precompiled binaries or whatever directly from Github.

[miyuru]

If you have IPv6, remove IPv4 to see how many tools break, because github does not have IPv6.

Composer is useless in a native IPv6 only servers.