anchor.diff:          | Function of RParameter list * HasVarArgs
           | Value
   
  +    [<Literal>] 
  +    let RDateOffset = 25569.
  +
       open Microsoft.Win32
   
       let characterDevice = new CharacterDeviceInterceptor()
  
positive.code:                        | Some res -> res
                         | _ ->  failwithf "No default converter registered from R %s " (sexp.Type.ToString())
          
      [<Literal>] 
      let RDateOffset = 25569.
      let createDateVector (dv: seq<DateTime>) = 
          let vec = engine.CreateNumericVector [| for x in dv -> x.ToOADate() - RDateOffset |]
          vec.SetAttribute("class", engine.CreateCharacterVector [|"Date"|])
  
negative.code:             let expr = sprintf "%s::%s" packageName funcName
              eval expr
  
      /// Convert a value to a value in R.
      /// Generally you shouldn't use this function - it is mainly for testing.
      let toR (value: obj) = RInteropInternal.toR value |> snd
  
  
  [<AutoOpen>]
  module RDotNetExtensions2 = 
  