Aren’t membranes incompatible with private data via WeakMaps?

[Axel Rauschmayer]

Take, for example, the following class, which uses WeakMaps for its private data:

```js
let _counter = new WeakMap();
let _action = new WeakMap();
class Countdown {
    constructor(counter, action) {
        _counter.set(this, counter);
        _action.set(this, action);
    }
    dec() {
        let counter = _counter.get(this);
        if (counter < 1) return;
        counter--;
        _counter.set(this, counter);
        if (counter === 0) {
            _action.get(this)();
        }
    }
}
```

If you wrap an instance of `Countdown` with a revocable Proxy (e.g. when it is returned by a method inside a membrane) that resets its private state, because its `this` changes.

Right? If yes then I’d expect that to cause problems for code that uses WeakMaps for private data.

-- 
Dr. Axel Rauschmayer
axel at rauschma.de
rauschma.de