Q: Should I release proxy()-wrapped callbacks?

The language in the README is a bit confusing because proxies refer to wrapped workers but there's also the `proxy()` method to wrap callbacks:

```javascript
const worker = Comlink.wrap( new Worker(/* ... */) );
const callback = Comlink.proxy( result => {

});
worker.doWorkAndReport( callback );
```

Should I do `callback[ Comlink.releaseProxy ]();` when I no longer need the callback?