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Right, but I think the complaint was that it was still immature and missing some use-cases covered by the old framework.

Anyway, I do hope they succeed and the .NET 5 unification goes smoothly. I want those C# 9 features - but I also need some old third-party libraries to keep working.

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Which ones, if you don't mind me asking out of curiosity?

Which features? Mostly data classes, a.k.a. records, and (from C# 8) non-nullable references. Kotlin has had these features for years and it makes things so much easier and cleaner IMHO.

I believe they tried to keep the C# version independently from the framework version, so people can use the new C# version on a old .net framework.

But things seem impossible for some new features, for example async steam just need new feature from core CLR.

So after .C#8, they decide only to support it on .NET core

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