It seems that the *+ld+json is an issue for IETF and cannot be done.
I think that, at this point, we should remove this thing from the JSON-LD spec and finalize the spec with ld+json. I do not think we should make the progress towards a Rec stop because of that.
See https://lists.w3.org/Archives/Public/public-json-ld-wg/2020Feb/0024.html.
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