See `fetch/api/request/request-init-stream.any.js`: If you just do ```js const body = new ReadableStream(); const request = new Request("...", { method, body, duplex }); assert_equals(request.body, body); ``` `request.body` doesn't equal `body`. I'm not quite sure what we're doing, but here's what changes: ```patch ReadableStream { - locked: false, - [state]: 'readable', + locked: true, + [state]: 'closed', [supportsBYOB]: false, [length]: undefined } ```