Does tart support pushing VMs to OCI registries incrementally?

[dataprolet]

I'm used to pushing and pulling to and from OCI registires in incremental layers and expected the same from tart. But after changing a little something on a VM and pushing it again to my ProGet feed it pushed the complete VM again.
I found this question and was wondering if this is still not supported?

[fkorotkov]

There is some "incrementability" where before pushing a 500 Mb layer Tart checks if it exists already:

tart/Sources/tart/OCI/Layerizer/DiskV2.swift

Lines 48 to 50 in a4edc6a

	if try await !registry.blobExists(compressedDataDigest) {
	_ = try await registry.pushBlob(fromData: compressedData, chunkSizeMb: chunkSizeMb, digest: compressedDataDigest)
	}

But we don't anything on a very granular incremental level.

[dataprolet]

Okay, my scenario is that I have a freshly installed macOS VM that I have already pushed to my registry. Now I booted into that VM and just change some settings and pushed it again to my registry expecting that it only pushes the respecive layer(s) but it pushed the whole image again. Am I wrongly assuming this to work like this or am I doing something wrong?

[edigaryev]

1. Which registry implementation are you using?

2. How do you determine that the modified VM image was pushed completely rather than incrementally?