Re: [w3c/webcomponents] [idea] Ability to define Custom Element attributes (and optionally enable getters/setters for those attributes). (#517)

Sure, performance could degrade but what you want isn't possible without overriding `set/getAttribute` which would create another performance bottleneck, unless it were implemented natively, which I don't see happening anytime soon, if ever. Your performance issue is also hypothetical. For your use case, I would suggest you use properties for everything and don't have linked attributes. Properties are faster to set by a factor of about 3 on any element, anyways.

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