I wish JS had Shape objects, which would not only ease performance
optimization for the benefit of JS engines (
https://youtu.be/5nmpokoRaZI?t=871), but also helps for validation, like an
interface
```js
shape Point { x: Number, y: Number, name: String };
const p = Point({x: 1, y: 2, name: 'foo'})
const p = Point({x: 1, y: 2, naem: 'foo'}) // throws
```
That object would have its properties immutable
I think proposal-first-class-protocols (
https://github.com/michaelficarra/proposal-first-class-protocols/issues/27#issuecomment-386975099)
could more or less directly do that feature
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