Memory leak when writing to a fetch request in stream #5665

const { readable, writable } = new TransformStream<Uint8Array>();
const writer = writable.getWriter();

const responsePromise = fetch('https://reqbin.com/echo/post/json', {
	method: 'POST',
	headers: {
		'Content-Type': 'application/json',
		'User-Agent': 'PostmanRuntime/7.49.1',
	},
	body: readable,
});

const encoder = new TextEncoder()

for (let i = 0; i < 1000000000; i++) {
	await writer.ready;
	await writer.write(encoder.encode(JSON.stringify({ hello: 'world' })));
	await new Promise((resolve) => setTimeout(resolve, 1));
}

await writer.close();

const response = await responsePromise;
if (!response.ok) {
	return new Response(`Upstream server responded with ${response.status}`, { status: 502 });
}

return response;