If content refers to "with words" and context refers to "with meaning", then all of what git and github does seems to be the tip of the iceberg, so to speak. Integration of development on anything is context-driven. My point is that with UNIX diff and merge, and zfs snapshot, you have everything git and github have, plus bit-level integrity. Someone refute this! Someone who has developed even a small software system with collaborators and integrators in the workflow. Thanks.