Re: [w3c/webcomponents] JavaScript bundlers, HMR and customElements.define() (#829)

We've also polyfilled `observedAttributes` so that they're mutable too now (on re-definition):

https://github.com/vegarringdal/custom-elements-hmr-polyfill

Two distinct `RenderStrategies` allow the atomic and full re-flow of the DOM to re-create elements that have changed. Buffering is implemented to limit the round-trips.

Anyway, it would be nice to see the standard supporting HMR for Web Components in a way that we wouldn't need any polyfills but in general the issue is pragmatically solved now.

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