for instance, the F# example from https://fsharpforfunandprofit.com/posts/designing-for-correc...
can be done in C# like https://gist.github.com/keithn/ceeeed5f7eb567e1b2333747065d1...
almost similar amount of code, however, no exhaustive checking. Not that I find that to be much of a problem, but it would be nice