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Java: "Sorry, but the developers of
Peanutdidn't declare it to implement theCrackableinterface, even though it has all the relevant methods, so if you want to treat it like a nut your choices are write a wrapper class or call those methods using Reflections"Swift’s extensions system has spoiled me, and I feel the pain of this whenever I have to write Java
You should take a look at kotlin, pretty similar to swift and fully interoperable with java.
Ditto, but Rust's traits. God those are so fun. It's like duck typing a la Python but you can just slap whatever methods you want on a foreign type without worrying about breaking anything because they're only visible to the current crate (or other crates that import the Trait)