Wow, finally a universal display link across macOS an iOS. That's a big deal if you've ever had to translate between CVDisplayLink and CADisplayLink. CV doesn't have any frame rate controls, and this one has that and latency controls.
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This is also a problem. os/log.h needs a warning level just like the compiler and all standard logging systems. No matter how much os_log wants to argue to not have one. Having to translate to default, error, fault is not good.
Logger.warning()
This method is functionally equivalent to the error(_:) method.