anchor.diff:              // also set the Workbook and Worksheet for the Range object itself
               rng.SetWorkbookName(wbname)
               rng.SetWorksheetName(wsname)
  +        override self.Type = ReferenceType.ReferenceRange
           override self.ToString() =
               let pth = match self.Path with
                         | Some(pth) -> pth
  
positive.code:             self.getYTop() = r.getYTop() &&
              self.getYBottom() = r.getYBottom()
  
      type Reference(path: string option, wbname: string option, wsname: string option) =
          let mutable _path: string option = path
          let mutable _wbn: string option = wbname
  
negative.code: 
      and ReferenceString(wsname: string option, value: string) =
          inherit Reference(None, None, wsname)
          override self.Type = ReferenceType.ReferenceString
          member self.Value = value
          override self.ToString() = "String(" + value + ")"
          override self.Equals(obj: obj) : bool =
  