My understanding is the on-disk storage might not be delta, as tar files, but the transfer on the wire is... could be wrong, but I think they intentionally made

My understanding is the on-disk storage might not be delta, as tar files, but the transfer on the wire is... could be wrong, but I think they intentionally made delta-transfer a docker registry network concern? I suppose if you wanted delta storage on-disk that again could be an implementation concern, knowing where to pull and reassemble the bits into a standard image? Oh and it uses gzip compression on the wire and possibly elsewhere, again a form of delta compression.