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> Because of “retina”, you also have to create separate files for 1x, 2x, and now 3x-scale

OT but why do you need three different and not just go with the 3x which you scale down?

Designers have more possibilities with 3x and 2x than with 1x as you can draw small details. If you scale them to 1x, the icon will look blurry, because the details doesn't scale well. If you want high level of polish, you typically make at least some touches to the scaled down icons.

Of course, in the context of the original ascii art icons, that level of polish doesn't matter.

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