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But custom-object applies only to one variable. Is it possible to create a custom class, like in Java, C#, etc., from which I can create multiple objects?
I won't say that, all by itself, C# 9 is worth the migration to .NET 5 (I might make that claim about C# 8 and .NET Core 3.x, though). The new version of C# 9 is more than just a nice feature of .NET ...