- https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/proposals/csharp-9.0/module-initializers
- https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csharp-9#pattern-matching-enhancements
- https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/configure-language-version
- https://devblogs.microsoft.com/dotnet/introducing-net-5/