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To convert a ReadableStream to a Uint8Array, read its contents into an ArrayBuffer with Bun.readableStreamToArrayBuffer, then create a Uint8Array that points to the buffer. 
const stream = new ReadableStream();
const buf = await Bun.readableStreamToArrayBuffer(stream);
const uint8 = new Uint8Array(buf);
Bun.readableStreamToBytes converts to a Uint8Array directly. 
const stream = new ReadableStream();
const uint8 = await Bun.readableStreamToBytes(stream);
See Bun’s other ReadableStream conversion functions.