WeakSets are perfect for branding and are how I would expect web platform class branding to be explained.
```js
const foos = new WeakSet();
class Foo {
constructor() {
foos.add(this);
}
method() {
if (!foos.has(this)) {
throw new TypeError("Foo.prototype.method called on an incompatible
object!");
}
}
}
```
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