cachix VS dhall-aws-cloudformation

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I've been trying to gradually introduce Nix more into my development.[0]

One roadblock I haven't been able to overcome is integrating Nix in CI. In my case, I use CircleCI. I know there are Nix-centric CI platforms, but I've invested a lot into CircleCI and would like to stay.

The problem I hit is that if I switch from something like a sqlfluff Docker container to a Nix Docker container, my build job goes from 15s to 2m+ because now I have to download several gigs within the CI job and build my Nix environment from scratch.[1]

I tried Cachix, but the best I could get was bringing the job down to 55s (a roughly 3x performance penalty from an off-the-shelf Docker container).[2]

How does FlakeHub Cache's performance in CI compare to the default Nux cache or to Cachix?

[0] https://mtlynch.io/notes/nix-dev-environment/

[1] https://github.com/cachix/cachix/issues/579

[2] https://github.com/cachix/cachix/issues/579#issuecomment-175...

I have been writing a fair amount of Dhall using autogenerated CloudFormation bindings ( https://github.com/jcouyang/dhall-aws-cloudformation/ ). It is a fantastic way to reduce boilerplate and factor out recurring blobs. My main frustration is that the type checker is not smart enough (or maybe the type system is undecidable?) - every time you want to use a polymorphic function, you must pass in the type parameters yourself (this is also true for empty lists and `None`). This makes simple FP idioms extremely noisy, to the point where you're better off writing longhand. In a language that's meant to be alleviating YAML/JSON boilerplate.

It's still a massive improvement, but it could be so much better if the typechecker was smarter.