Is there a registered media type for when using the structured clone extension about cbor-x HOT 2 CLOSED

I will leave the media type aspect for the discussion question, but what is the error you are getting? You shouldn't need the structuredClone flag to enable the value sharing tags that are used for structured clone referencing for the decoder, they should always be enabled. Usually the more pertinent thing that needs to be configured is how objects are represented, and whether they use CBOR maps or use record tags. And there is a different default for new Encoder().encode() (uses record tags for objects) than just encode() (use maps).

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After your comment above and some experimenting, I realize my original post was in error. If I encode with new Encoder({ structuredClone: true }).encode(), both new Ecoder({ structuredClone: true }).decode() and plain old decode() work. The error is the other way around.

I have to use new Encoder({ structuredClone: true }).encode() because I need duplicate object references preserved. I am still confused though about how I should specify the media type but I'll take that up in the discussion.

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