Should we register modules directly?

I was thinking: perhaps it would make sense to register modules directly?

E.g. turn this:
```js
var rust = require('rustify')

var wasm = rust`
#[no_mangle]
pub fn add_one(x: i32) -> i32 {
x + 1
}
`

WebAssembly.instantiate(wasm, {})
.then(function (res) {
var addOne = res.instance.exports.add_one
console.log(addOne(41))
console.log(addOne(68))
}).catch(function (e) {
console.error('Creating WASM module failed', e)
})
```
Into this:
```js
var rust = require('rustify')

var wasm = rust`
#[no_mangle]
pub fn add_one(x: i32) -> i32 {
x + 1
}
`

wasm.then((mod) => {
console.log(mod.add_one(41))
console.log(mod.add_one(68))
}).catch((e) => console.error('WASM error', e))
```

The benefit is that there's way less code to remember (ugh, `res.instance.exports`). The downside is that we're no long just exposing a Uint8Array, so doing things like registering a function twice is not going to be possible.

Would this be worth it?