I started digging around about spans, and I have found official reference information that it is supported as System.Span<T> since .NET Standard 2.1 here. However, I have Xamarin Application with .NET Standard 2.0 and C# 7.3, where I can use System.Span without issues, I can even use Reverse() which I have seen discussions dealing with lack of it in Standard 2.0.
I am so confused about that, can anyone explain why I can use it, where it shouldn't work?