`AiTextToImageOutput` should be a ReadableStream instead of `Uint8Array`

[Kynson]

Hello,

I am using env.AI.run('@cf/stabilityai/stable-diffusion-xl-base-1.0', input) to generate image. The return type of this function is AiTextToImageOutput which is a type alias of Uint8Array. Yet, env.AI.run() seems to return a ReadableStream instead of Uint8Array

Minimal reproducible example

const result = await env.AI.run(
    "@cf/stabilityai/stable-diffusion-xl-base-1.0",
   {
      prompt:
        "An artistic cartoon of a cat playing with a new technology gadget in a sunny computer lab, surrounded by colorful flowers and Server guarantees serene background",
      num_steps: 20,
      guidance: 7,
   }
  );
// logs:
// ReadableStream {
//  locked: false,
//  [state]: 'readable',
//  [supportsBYOB]: true,
//  [length]: undefined
// }
console.log(result);

Tested with

wrangler version: 3.67.1 @cloudflare/workers-types version: 4.20240725.0 node version: 22.5.0

I am happy to submit a PR if this a bug