I've been submitting an update to Merlin ocaml/merlin#1475 which uses Yojson 2.0.0. It turns out the CI on Windows fails because Yojson 2.0.0 is not available.

Further inspection shows that it uses https://github.com/fdopen/opam-repository-mingw.git#opam2 which is apparently discontinued. That probably means that there won't be many if all updates going forward. Though even despite the blog post stating August 2021 there still seems to be activity in that repository.

Looking at the source code

this seems to be a deliberate decision, hence I am opening this ticket to discuss what's the best way to go forward with this.