The original repo has a pretty complete v4 release that I'm using (docs).

As I recall, I needed v4 because of this change:

Added new type, ClaimStrings, which will correctly handle properties such as aud that can be either an array of strings or a single string. ClaimStrings is an alias to []string, but with custom decoding behavior. This means all the built in aud validation behavior now expects []string instead of string. This was a common request.

It would be nice to see that picked up and moved forward, as well.