Re: [whatwg/fetch] Expected behavior of Response.redirect(null)? (Issue #1764)

Browser behavior is correct here. The processing of USVString arguments is given here: https://webidl.spec.whatwg.org/#js-USVString which defers to https://webidl.spec.whatwg.org/#js-DOMString which defers to https://tc39.es/ecma262/multipage/abstract-operations.html#sec-tostring .

Note that the argument passed to `redirect()` is not reflected in `response.url`, but instead in `response.headers.get("Location")`. You can see that this returns, e.g., `https://example.com/null`, as the result of parsing the relative URL `"null"` against the base URL `https://example.com/`.

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