What if you used a target parameter to indicate assignment?
```js
operator +(a, b, target = new obj()) {
target.val = a.val + b.val;
return target;
}
// or... no arrow functions...
operator +(other, target = new obj()) {
target.val = this.val + other.val;
return target;
}
// or... just a boolean
operator +(other, assign) {
let target = assign ? this : new obj();
target.val = this.val + other.val;
return target;
}
```
And throw a TypeError if an assignment does not return the same object.
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