anchor.diff:          | "9.0" -> Some MonoAndroidVersion.V9
           | "10"
           | "10.0" -> Some MonoAndroidVersion.V10
  +        | "11"
  +        | "11.0" -> Some MonoAndroidVersion.V11
  +        | "12"
  +        | "12.0" -> Some MonoAndroidVersion.V12
           | _ -> None
   
   [<RequireQualifiedAccess>]
  
positive.code:     | V8_1
      | V9
      | V10
      member this.ShortString() =
          match this with
          | MonoAndroidVersion.V1    -> ""
  
negative.code:         | MonoAndroid MonoAndroidVersion.V8_1 -> [ MonoAndroid MonoAndroidVersion.V8 ]
          | MonoAndroid MonoAndroidVersion.V9 -> [ MonoAndroid MonoAndroidVersion.V8_1 ]
          | MonoAndroid MonoAndroidVersion.V10 -> [ MonoAndroid MonoAndroidVersion.V9; DotNetStandard DotNetStandardVersion.V2_1 ]
          | MonoAndroid MonoAndroidVersion.V11 -> [ MonoAndroid MonoAndroidVersion.V10 ]
          | MonoAndroid MonoAndroidVersion.V12 -> [ MonoAndroid MonoAndroidVersion.V11 ]
          | MonoTouch -> [ DotNetStandard DotNetStandardVersion.V1_6 ]
          | MonoMac -> [ DotNetStandard DotNetStandardVersion.V1_6 ]
          | Native _ -> [ ]
  