VS 2017: Xamarin.iOS 12.4. (no more available on vs mac)
VS 2019: Xamarin.iOS 12.10. (ios apps wont compile with duplicate Memory error when using Span in a netstandard lib)
VS2019preview: Xamarin.iOS 12.14
VS Mac: Xamarin.iOS 12.8.
VS Mac Preview: Xamarin.iOS 12.10.
MS guys are drunk
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