I am looking at aligning the types defined in this repository with the
OCI image specification, and potentially exchanging local types with
those from the specification.
This patch is a stepping-stone towards that effort, but as this changes
the format of the serialized JSON, I wanted to put this up first before
proceeding with the other work in case there are concerns.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
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