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In the same breath Darwin is more then just iOS so do you say Mac or OSX or what?

Darwin isn't the kernel, it's an OS[1]. XNU is the kernel[2].

However, this is impressive none the less.

[1]https://en.wikipedia.org/wiki/Darwin_(operating_system) [2]https://en.wikipedia.org/wiki/XNU

I mean, if someone ported Linux to a toaster, you wouldn't say they posted the Android core to a toaster. Userspace is what people care about when they mention any OS by name (IMO).

The title would have been equally correct if it said OS X, which tells you that the title is essentially meaningless.