Re: [whatwg/fetch] Fetch would silently ignore the input body if it's not an existing data type? (#371)

I think Firefox's behavior is correct. Objects can be converted to USVStrings; this happens automatically in IDL.

In general everywhere on the platform that accepts a string will just convert your object to a string instead of throwing. E.g.

```js
document.body.setAttribute("a", { foo: "bar" });
console.assert(document.body.getAttribute("a") === "[object Object]");

document.body.setAttribute("b", { toString() { return "this is intentional"; } });
console.assert(document.body.getAttribute("b") === "this is intentional");
```

I don't think Request/Response should be any different.

What you really want here is a strongly typed language, like TypeScript.

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