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The dock and launchd were rewritten in Swift for Sierra.

There is a WWDC session talking about it.

Well that doesn't bode well ;) Sierra's dock is sooo buggy. I have to restart my machine numerous times a day because the dock stops working, literally doesn't work lol. I'm sure theres a way to restart just the dock app, but eh i've been quite busy. Sierra has been one of the buggiest version of Mac I can remember using.

I would surprised if they actually did tho. I know someone did some static analysis of the apps for mac and iOS and found Swift was barely used at all.

The dock is a separate process, as is Finder, you can just kill them.

I have to stomp on coreaudiod a few times a month because my USB DAC stops responding.

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