anchor.diff:  
           elements
           |> ResizeArray.toArray
  -        |> assertEqual
  +        |> Collection.assertEqual
               [| 'A'; 'C'; 'B'; 'F'; 'A'; 'G'; 'B'; 'D'; |]
   
   [<Test>]
  
positive.code:     |> LongMap.ofArray
      |> LongMap.toSeq
      |> Seq.toArray
      |> assertEqual
          [| (2L, 'd'); (3L, 'b'); (4L, 'G'); (5L, 'a'); (11L, 'F'); (12L, 'b'); (14L, 'c'); (17L, 'a'); |]
  
  [<Test>]
  
negative.code: 
          elements
          |> ResizeArray.toArray
          |> Collection.assertEqual
              [| 114L; 114L; 112L; 84L; 106L; 80L; 107L; 109L; |]
  
  [<Test>]
  