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

The optimization will result in non-interoperable behavior: since [Get](https://tc39.github.io/ecma262/#sec-get-o-p) can have side effects, its timing is observable/actionable by developer. I could be remembering this wrong (@bzbarsky please correct me, since you pointed this out way back then).

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https://github.com/w3c/webcomponents/issues/417#issuecomment-193365254