Re: [xhr] FormData.prototype.get should return `undefined` for not-present entries, instead of `null` (#27)

Yeah, I agree with all that. I think it would be better to be consistent though since this is so clearly parallel to a Map. E.g. I can easily see myself or another developer writing code like `const thingy = formData.get("key"); if (thingy !== undefined) { ... }` based on their experiences with Maps.

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