[whateveracct]

Emulating sums with interfaces isn't the worst but proper sums with exhaustive checking make it way easier for the consumers of your code to also perform matches in a maintainable way. When I emulate sums, I keep the matching internal and at best I expose a function that is the equivalent of an exhaustive match (which takes a function per case)

I've never run into finalizer issues (or finalizers at all really) in Haskell but I'm sure they exist. What libraries in particular used finalizers that you had issues with? In general though I find resource management much easier in Haskell thanks to bracket, ResourceT, and the (imo very good!) exception handling stuff. Async exceptions in particular are a surprisingly nice feature when combined with threading!

The biggest place lack of parametric polymorphism hurts is in concurrency. I have to hand-roll so much concurrency in Go and I don't really have a good option for abstracting over various patterns.

> I'm going to continue using both Go and Haskell, I'm happy with both.

Yeah same here. I'm glad to have them both in my toolkit.