Re: [w3c/webcomponents] defineElement should not cache lifecycle callbacks and prototype of a custom element class (#417)

I don't find the argument in https://github.com/w3c/webcomponents/issues/417#issuecomment-192594110 compelling.  Overriding methods on instance is something JavaScript developers regularly do, and I don't think restricting their ability to do that is rather arbitrary.

> Even if we could make it fast, it encourages bad behavior. Custom elements (and ES6 classes) are both about encouraging good behavior.

I completely disagree with that statement. [Late binding](https://en.wikipedia.org/wiki/Late_binding) and [duck typing](https://en.wikipedia.org/wiki/Duck_typing) are two important features of JavaScript.

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