Comment by camgunz

> However, a global tag registry can still potentially be useful in that, given CBOR encoded data with a tag that my decoder doesn't support, it may be easier for a human to infer the intended meaning.

Yeah if MP is conservative and CBOR is progressive, I'm slightly less conservative than MP: I'd support UUIDs and bignums. But again, they'd have to be very optional, like in the "we're only reserving these tags, not in any way mandating support" sense.