One of the build outputs of the C driver is a source archive. This is posted on the GitHub release.

The source archive itself is not a simple archive of the source directory, but rather an archive composed of some generated components (documentation) as well as a subset of the original source components (not all of the source tree is included). Keeping this archive process up-to-date with changes to the driver is tedious and it is unknown how much benefit it provides to our users over a regular Git archive.