`JsonWebSignature2020` required header fields seem to be missing

[matgnt]

I've been debugging some MIW credentials and the header of the jws seems to look like this:

{"alg": "EdDSA"}

According to:

https://w3c.github.io/vc-jws-2020/#json-web-signature-2020

the header should contain a bit more:
I used this one here to compare:
https://github.com/decentralized-identity/JWS-Test-Suite/blob/39547f5dc6da289a3f7e460fd6b782b9c9dc898b/data/presentations/presentation-1.json#L47

{"b64": false, "crit": ["b64"], "alg": "EdDSA"}

I think this is required for kind of backward compatibility, that implementations without support for detached sigs can recognize and fail because at least they understand the crit list of required fields.

--
Matthias Binzer

[koptan]

Assigned to @koptan,