What preview photo formats are available?

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I'm iterating over AVCapturePhotoSettings.availablePreviewPhotoPixelFormatTypes like this:

for av in availablePreviewPhotoPixelFormatTypes {
    print("Avbl preview type: \(av)")
}

And I get non-descriptive numbers like:

Avbl preview type: 875704422
Avbl preview type: 875704438
Avbl preview type: 1111970369

What do these actually mean? What difference will it make if I choose one instead of another? Where can I find documentation about them?

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