Re: [WICG/webcomponents] [element-internals] How to get internals in base class and subclass, without leaking it to public (Issue #962)

Is there something wrong with the obvious approach of explicit communication?

```js
class Base extends HTMLElement {
  #_
  
  constructor(forwardInternals) {
    super()
    let internals = this.attachInternals()
    this.#_ = internals
    forwardInternals?.(internals)
  }
}

class MyEl extends Base {
  #_
  
  constructor() {
    // if you want to be open for further extension, repeat the `forwardInternals` thing in this constructor
    let internals;
    super(int => { internals = int })
    this.#_ = internals
  }
}
```

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