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I get the impression that at every "resolution", we're really at the native retina resolution, but with UI widgets scaled to different levels, and different present-day resolutions reported to applications. Can anyone with one of these beauties confirm?

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Yes, but this just amounts to scaling via the compositor and graphics stack (hardware-accellerated, of course), as opposed to being left to the 'screen' (post-GPU-hardware/firmware) as would be the case when actually driving a screen at non-native resolution.

See the Safari/Chrome comparison in the article to see what this means in real terms...

I can can confirm this is false- the resolutions really are different.

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