We have two definitions of layers:

1. https://github.com/opencontainers/image-spec/blob/master/manifest.md#image-manifest-property-descriptions
2. Layer DiffIDs specified in https://github.com/opencontainers/image-spec/blob/master/serialization.md#terminology

Which list should we consider for unpacking/oci-runtime-bundling?