anchor.diff:      | V4_6_2
       | V4_6_3
       | V4_7
  +    | V4_7_1
       | V5_0
       override this.ToString() =
           match this with
  
positive.code:         | V4_6_2    -> "v4.6.2"
          | V4_6_3    -> "v4.6.3"
          | V4_7      -> "v4.7"
          | V5_0      -> "v5.0"
  
      member this.ShortString() =
  
negative.code:         FrameworkVersion.V4_6_2
          FrameworkVersion.V4_6_3
          FrameworkVersion.V4_7
          FrameworkVersion.V4_7_1
          FrameworkVersion.V5_0
      ]
  
  