[proposal] Persistent variables in functions/methods

[Neek Sandhu]

It’d work but won’t be beautiful. With this proposal, code would be much easier to reason about.

Also it breaks encapsulation (logical, semantic and syntactic), stuff should live where it belongs. If it “belongs” inside a function, then it should “live” inside function body `{ }`

In the same context, notice how we evolved from callbacks to Promises and now to async/await shorthands.

```javascript
const res = await fetch('http://example.com')
```

More pretty than

```javascript
fetch('http://example.com')
    .then(res => /* impl */)
```

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