I have a generic input parameter for a wrapper aro...

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[octylFractal]

I have a generic input parameter for a wrapper around function (INPUT) -> RESULT. Now I have some extension functions for that wrapper class, like such: fun TestInputs<Any, SomeResult>.foo(). However, I can't call the extension function if I have a TestInputs<String, SomeResult>. So I tried extracting it to a generic parameter: fun <EXTIN: Any> TestInputs<EXTIN, SomeResult>.foo(), but now I can't call this method inside the extension function: converts(input: I, result: R) with a String, because the input parameter becomes EXTIN, which extends Any, but which String apparently doesn't extend. I'm confused on that last point, why can I not pass a String to a method which should take Any, and how can I make it work?