anchor.diff:      Convert.ToSingle(1.f) |> equal x
       Convert.ToSingle(1.) |> equal x
       Convert.ToSingle(1.m) |> equal x
  -    Convert.ToSingle("1.") |> equal x
  +    parse Convert.ToSingle "1." |> equal x
       (fun () -> Convert.ToSingle("foo")) |> throwsError "Input string was not in a correct format."
   
   [<Test>]
  
positive.code:     Convert.ToDouble(1.f) |> equal x
      Convert.ToDouble(1.) |> equal x
      Convert.ToDouble(1.m) |> equal x
      Convert.ToDouble("1.") |> equal x
      (fun () -> Convert.ToDouble("foo")) |> throwsError "Input string was not in a correct format."
  
  [<Test>]
  
negative.code:     Convert.ToDecimal(1.f) |> equal x
      Convert.ToDecimal(1.) |> equal x
      Convert.ToDecimal(1.m) |> equal x
      parse Convert.ToDecimal "1." |> equal x
      (fun () -> Convert.ToDecimal("foo")) |> throwsError "Input string was not in a correct format."
  
  // String to number convertions (with base)
  