[Kwpolska]

The only scales supported by Apple software are integer scales (1x, 2x, 3x). The iPhone 6 Plus had a 2.6x screen — iOS would render at 3x and then scale the image down to fit. https://www.paintcodeapp.com/news/iphone-6-screens-demystifi...

[bombcar]

See https://9to5mac.com/2016/12/02/15-inch-macbook-pro-screen-re... - it renders at 8x or something and scales down inexactly.

[Toutouxc]

The article clearly states that macOS always draws 2x and just displays the result, individual pixels be damned. Anyone can confirm this simply by taking a screenshot and looking at the resolution (screenshots are always the size of the underlying framebuffer)