What package? My project may have a dependency on a specific commit that's between point releases.

The problem is not packages, it's the index, containing 16000 subdirectories,

So the packages themselves aren't part of the repository?

No, only references to the repositories themselves are. The total Specs repo is only 300 megabyte, which comes to about 18 kilobyte per package on average.

It's still absolutely ludicrous to use git for it, or worse, to bother github with it.