Support Aeson 2.x and LTS 19?

[nodew]

From this PR #332, I see
LTS 19 unfortunately doesn't work, due to the Aeson 2.x versioning.
Could we upgrade Aeson to 2.x? Is there any hard dependency on Aeson 1.x?

[serras]

The problem is that some of the dependencies we use are not compatible with Aeson 1.x. But I can try again, maybe it works this time!

[sfwc]

Has there been any progress on this recently? I'd like to use mu-haskell in a new project, but not having LTS 19 is turning out to be a dealbreaker.

Taking a stab at it myself, the issues with Aeson 2 seem relatively easy to fix (just KeyMap for objects, plus passing the -json build flag to the graphql package), but next I see an issue in http2-client (maybe GHC version-related?) that I'm not immediately sure what to do about.

[serras]

Not really. The main problem is indeed http2-client, which no longer compiles. Not only that, the package http2 has added its own Client module which conflicts with that one :/

[listx]

The problem is that some of the dependencies we use are not compatible with Aeson 1.x. But I can try again, maybe it works this time!

I think you meant to say 2.x?

Anyway, is there some way others can help out here? Are we blocked by haskell-grpc-native/http2-client#79?

[serras]

@listx That's exactly the blocker