Add an AS Equivalent to Option in Rust to the AS Standard Library

[torch2424]

One thing about AS is that basic types cannot be nullable. However, I've been designing some APIs that need some nullable Basic types, and I've been working around them. But I think it'd be cool just to write up a quick equivalent to C#'s Nullable or Rust's Option.

I could super easily add this myself. I personally like C#'s interface more, but I think it should be named Optional. That way, it doesn't conflict with our already exisiting idea of nullability in the docs.

What do y'all think @dcodeIO @MaxGraey @jtenner @sirwillem ? 😄

[jtenner]

I believe that this feature requires multi-value returns, if I am not mistaken.

[MaxGraey]

One thing about AS is that basic types cannot be nullable

It's just temporary limitation. And as @jtenner mentioned it's depending on multi-value proposal

[willemneal]

Here was what I made a year ago when I was working with WASI and wanted to get the result and the error:
https://github.com/WebAssemblyOS/wasmos/blob/a454ec8bd5b39253557745747c5d9120e18b9049/packages/assemblyscript/assembly/wasa/index.ts

As @jtenner points out multi-value means that we don't have to deal with an allocation each time, but that might be okay for now.

[torch2424]

Ahhhh that makes sense. I'll wait for that than, thanks everyone! 😄 👍