Re: [whatwg/streams] Performance improvements (#490)

> There is also a difference between O[p] = v and defineProperty; the former triggers setters.

Right. However, these helpers are exclusively used on objects that are freshly constructed in the library, and thus do not have any setters.

I understand and sympathize with your concern about maintaining a more direct mapping from spec to code. Would a comment pointing out the equivalent `Object.defineProperty` call serve this purpose as well?

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