Re: [w3c/webcomponents] Non-class based example of customElement.define() (#587)

Okay, nevermind, the engine is using it, but what happened in my case is a subclass was calling the super class with traditional ES5-style `constructor.apply` which makes `new.target` undefined.

So my above comment was wrong about `new.target`, but this still shows how much of a pain point this is. 


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