Are your "extensions" unnecessary with WIT native `future` and `stream`?

Hi. Interesting project.

It seems https://obeli.sk/docs/latest/concepts/extensions/ is kinda unnecessary now with the latest WIT work now having native `future<T>` and `stream<T>` types.

https://github.com/WebAssembly/component-model/blob/main/design/mvp/Concurrency.md

Interested to hear what you think about that.