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I meant 'v' as in 'version' of C#, here's a good reference on it: https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csh...

"We see similar developments with C# borrowing features from F#, with records in v9, pattern matching, etc."

Parsing that sentence the subject is C# and F# is referenced, but the subject of the sentence didn't change, it remained C# thus logically v9 applies to it.

C# 9.0: https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csh...

it is a C# language version. https://docs.microsoft.com/en-us/dotnet/csharp/whats-new/csh...

They meant version 9 of C#, the language.