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I have this issue with my new 2021 16" M1 Max MacBook Pro. It's connected to my Pro Display XDR, which I usually use something like SwitchResX to use in HiDPI mode at 3840x2160 on my previous Intel MBP. Now the ability to use 3840x2160 in HiDPI is not accessible in any such 3rd party resolution app.
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I use PageTabViewStyle() in my app and now when building in Xcode 13 beta and testing on an iOS 15 device, I get a crasher with this line. No issues when testing on an iOS 14.6 device. My app's build target is iOS 14.5 My crash shows this in logs. Removing just the .tabViewStyle(.page) or .tabViewStyle(PageTabViewStyle()) line (i've tried using both) stops the crasher. Simultaneous accesses to 0x282d8b750, but modification requires exclusive access. Previous access (a modification) started at SwiftUI`<redacted> + 72 (0x188b4e60c). Current access (a modification) started at: 0  libswiftCore.dylib         0x0000000185619790 swift_beginAccess + 576 1  SwiftUI              0x0000000188b4e5c4 <redacted> + 72
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I have the same question as well.. would be great to see this added to SwiftUI in a future beta
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Does iOS 14 change any of this? In the same boat now and Xcode beta is telling me this if I remove the value transformer: 'NSKeyedUnarchiveFromData' should not be used to for un-archiving and will be removed in a future release