The PuzzleFS container filesystem

This is a great point. I guess it could be worked around with some core mm+fs fu, but it would definitely not be simple.

> I guess an optimal system would use a block-chunked approach for downloads, but expand into full-file dedup in the local storage.

It was an explicit design goal of PuzzleFS not to have any translation step between the image that is pushed to the container registry and the one that's mounted+run on the host, so any translation step here would be a non-starter, which seems like you need to pick "one or the other" unfortunately.