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

like I've said, I'm OK with current status and extendability through `.concat` but you know what you extend so that if super has no `super.observedAttributes` you'll have an error trying to concat nothing.

In few words, we are making up inexistent problems because reality would be like the following:

  * if super is Array and you want RegExp you can `new RegExp("your-thing|" + super.stuff.join('|'))` (simplification)
  * if super is Array and you want extend you use `.concat`
  * if super is RegExp and you want extend either copy super.observables and enrich it without even calling super or use new RegExp
  * if super is RegExp and you want Array, you still new RegExp(['your', 'cases'].join('|') + super.stuff)

Since people will abuse these things and it's easy to get it wrong, I guess we'll stick with current status and that's it, it's like good old `Object.prototype.watch` where either you know upfront or you cannot spy on everything like a proxy would do.

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