Re: [w3c/webcomponents] Expose shadowRoot on element internals (#871)

@annevk this is very interesting, but first let me see if I fully understand the problem here:

1. a component that extends another component, and attaches a shadow root with mode closed, could be leaking the shadow root instance in the super inadvertently if the super attaches the element internals

2. a component that is extended by another component, could always access its shadow via element internals

Is that an accurate assessment of the encapsulation issue?

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