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kotlinlang

I wonder why `class` only implies `final` but `override` only implies `open`? Should "overridability" be `open`'s at all? I remember this is the only place where `final` is used.
```class A // final

interface B {
    fun foo()
}

class C : B {
    override fun foo() // final
}

open class D : B {
    override fun foo() // OPEN
}
```
if it's _final by default_ then `D.foo` should also just finalize overridability UNLESS you mark it `open`. Having both `open` and `final` is so inconsistent.