anchor.diff:          | FrameworkVersion.V4_7_2 -> "472"
           | FrameworkVersion.V4_8 -> "48"
           | FrameworkVersion.V5 -> "5.0"
  +        | FrameworkVersion.V5WithOs o -> "5.0-" + o.ToString()
   
       static member TryParse s =
           match s with
  
positive.code:     | V4_7_2
      | V4_8
      | V5
      override this.ToString() =
          match this with
          | V1        -> "v1.0"
  
negative.code:         | V4_7_2    -> "v4.7.2"
          | V4_8      -> "v4.8"
          | V5        -> "v5.0"
          | V5WithOs o-> "v5.0-" + o.ToString() 
  
      member this.ShortString() =
          match this with
  