anchor.diff:  
     [<Test>]
     let ``floor float`` () = <@ floor 1.5 @> |> check 1.0
  +
  +  [<Test>]
  +  let ``floor decimal`` () = <@ floor 1.5M @> |> check 1.0M
   
     [<Test>]
     let ``infinity`` () = <@ infinity @> |> check infinity
  
positive.code:   let ``ceil float`` () = <@ ceil 1.5 @> |> check 2.0
  
    [<Test>]
    let ``cos float`` () = <@ cos 0.5 @> |> check (cos 0.5)
  
    [<Test>]
  
negative.code: 
    [<Test>]
    let ``abs float`` () = <@ abs -1.0 @> |> check 1.0
  
    [<Test>]
    let ``abs decimal`` () = <@ abs -1.0M @> |> check 1.0M
  
    [<Test>]
    let ``acos float`` () = <@ acos 0.5 @> |> check (acos 0.5)
  