I'd heard of CSON before. I didn't remember hearing about CBOR (but I had an implementation of CBOR already starred on GitHub apparently). However, given the following:

> CBOR is defined in an Internet Standards Document, RFC 7049. The format has been designed to be stable for decades.

I see no reason to go with CSON over CBOR. In fact just the opposite.

I'd suggest something like CSON for display and editing (with Link items for binary data), CBOR for transmission.