Re: [WICG/webcomponents] case-sensitive access to HTML attributes (as they were written) would be useful for framework authors (Issue #1076)

Materializing Attr nodes is very slow. I would want something like `getAttributeNames()` that returned case-preserving names.

I worry about how tools will handle this. They can assume that attribute and tag names are case-insensitive and lowercase them all. It might be hard to say that they now need to preserve the case on _everything_. Should case-reserving only be added to `<template parseparts>` and hope that tools can be updated to treat just that specially?

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