Re: [w3c/webcomponents] CustomElementRegistry.prototype.get() and case sensitivity (#604)

> As far as I can tell and implemented, it's not case-insensitive:

As a consumer of the APIs, I would assume case-insensitive because it would seem that's how other parts of the DOM API behave. For example `querySelector()` and `setAttribute()`. Furthermore, if someone were to register `X-ELEMENT`, and it still upgrades `<x-element />`, but when you try and `get('x-element')` it returns `null`, then that would seem odd.

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