In C# I believe you can optionally mark generic classes/methods as covariant or contravariant. Is that not enough or does it not get exposed in the CLR or some

In C# I believe you can optionally mark generic classes/methods as covariant or contravariant. Is that not enough or does it not get exposed in the CLR or something? https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/in-generic-modifier https://docs.microsoft.com/en-us/dotnet/csharp/language-refe... https://docs.microsoft.com/en-us/dotnet/csharp/language-reference/keywords/out-generic-modifier https://docs.microsoft.com/en-us/dotnet/csharp/language-refe...