Would it be possible to have syntax like this? It's a feature supported by
other JS variants in some way (CoffeeScript, TS) that feels missing from
the spec. It's mainly useful as a convenient, terse way of setting
properties of an object on initialization.
```js
class Rectangle {
constructor (this.x, this.y, this.width, this.height) {}
setPosition(this.x, this.y) {}
setSize(this.width, this.height) {}
}
// equivalent to
class Rectangle {
constructor (x, y, width, height) {
this.x = x
this.y = y
this.width = width
this.height = height
}
// ...
}
// for regular constructor functions as well
function Rectangle (this.x, this.y, this.width, this.height) {}
```
Deconstructing and argument defaults should all work similarly
```js
function Point({ x: this.x, y: this.y }) {}
function Point(this.x = 0, this.y = 0) {}
function Point([this.x, this.y]) {}
```
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