h5
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Investigate new language features
https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-8
https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9
https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-10