Allen, Kevin: I think the key question about private state and how it interacts
with Anne's question is this.
Given a base class looking roughly like
```js
class HTMLElement extends Element {
constructor(...) {
super(...);
// ...other stuff...
this[Element.init]();
}
}
```
then, will the following work?
```js
class CustomElement extends HTMLElement {
[Element.init]() {
// initialize private state
}
}
```
Or would an actual constructor be required?
```js
class CustomElement extends HTMLElement {
constructor(...args) {
super(...args);
// initialize private state
}
}
```
Stated another way, which might be a bit stronger: will it be *lexically*
required that private state initialization be within the constructor, or will
it only be *temporally* required?
That question is, I think, what Anne is essentially asking when he asks about
features that are "tied to constructors".
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