How are CMYK colors converted tp RGB?

Glyphs 3 allows using CMYK colors, but CPAL table currently supports only RGB colors, so what formula is used to convert from CMYK to RGB (I might use this in glyphLib, though I’m yet to see Glyphs files using CMYK colors in the wild).

All color conversions are done using AppKit. NSColor has methods to that. ([color colorUsingColorSpaceName:NSCalibratedRGBColorSpace];

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