CBOR-LD Codecs and JSON-LD in general

Hi All!

I am interested in CBOR-LD Codecs and JSON-LD in general.

I am building a JS/TS stack. I have played with third party JSON-LD resolvers and related libs but am leaning towards implementing my own. To make that safer, I am looking for implementations to validate against.
 1. Which JSON-LD implementations (JS preferred but other languages ok) should I make sure I am compatible with to ensure my library fits into the ecosystem?
   1. Is there a good set of tests including json-ld test documents somewhere that I can use to compare my library behaviour?
   2. Are there known experimental additions to JSON-LD that seem to make sense to explore?
 2. Is there an implementation for CBOR-LD Codecs I can look at? 
   1. I am building towards Gordian Envelopes [1] so I am also curious if dCBOR [2] poses any problems to CBOR-LD Codecs?
Thanks!
Christoph

[1] - https://developer.blockchaincommons.com/envelope/
[2] - https://datatracker.ietf.org/doc/draft-mcnally-deterministic-cbor/