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"MacBook Pro laptops with touch bars are supported" Could someone with knowledge kindly explain to me why this is mentioned? Isn't the support -for modern OS's- supposed to be for the OS layer and not the hardware directly?

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The Mac core GUI and graphics libraries are slightly different on laptops with the touch bar, in ways that broke Racket's GUI libraries. You can see the commit that fixed it here: https://github.com/racket/gui/commit/b9e94f9c45e070beca79b28...

Racket includes an IDE as part of the language. I imagine this has to do with that.

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