Is js-ipfs-git on the roadmap ? And a question about delta-encoding of IPLD

It seems js-ipld-git is now archived. What are the plans ?

Git uses delta-encoding internally. Does IPFS simply put .git on IPLD like importing files, or use its own IPLD git format ?

Besides delta-encoding, a more general content/context aware encoding should be handy, for any blocks that involve revisions. Anyway applications should not interfere with storage. Say, for a block when it’s modified, the new block is stored and exchanged as an ipld-delta-encoded-block internally. What applications see doesn’t change. And at what layer will this be implemented. What about encryption then ?

I read ipfs/notes, and it seems to have been asked several times.