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Kotlin doesn't even have real pattern matching. Calling it integrating FP is a sad joke.

It's got algebraic types, and a typeclasses proposal (with a PR!) was actively worked on, last time I checked.

Algebraic types without being able to conveniently destructure them is maybe half the benefit at best.

Pattern matching has nothing to do with FP.

Only if you think algebraic types have nothing to do with FP, in which case you have a very idiosyncratic definition of FP.