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kotlinlang

<@U8NF48PGQ> What are you trying to acomplish? How would usage of this class look?

I was trying to emulate something like:
```
interface A : List&lt;List&lt;String&gt;&gt;
interface B : MutableList&lt;MutableList&lt;String&gt;&gt;, A
```

Effectively, taking the readonly/mutability divide one step further into generic parameters. With a construct like this, I can control mutability deeply for a container, rather than just at the shallow level of the container itself.  I ended up creating a workaround for this by copying the declarations and extension methods in `MutableList`, `MutableContainer`, etc. into my own custom implementations so that I never implement the same interface twice