Re: [w3c/webcomponents] [idea] Make use of `observedAttributes` optional (#565)

@rniwa Common use cases are building an element that wraps an object.

Assuming your are building a `<google-map>` custom element, and you are accepting all map properties; more than 30 properties,  through attributes; e.g., `center`, `zoom`, etc,  Then, you also want to monitor the attribute change and update the map when it is changed. It would be ideal to handle it dynamically rather than listing 30+ attributes(https://developers.google.com/maps/documentation/javascript/reference#MapOptions).

It's not exactly related to this issue, but I have tried to write a google map on this article. https://medium.com/allenhwkim/back-to-element-c4aecf3c6b64


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