anchor.diff:  
       /// Returns the number of elements in the set
       [<CompiledName("Count")>]
  -    let inline count (set : LongTagSet<'Tag>) : int =
  +    let inline count (set : LongTagSet<'Tag>) : int64 =
           // Retype as LongSet
           let set : LongSet = retype set
   
  
positive.code:     /// The set containing the given element.
      [<CompiledName("Singleton")>]
      let inline singleton (element : int64<'Tag>) : LongTagSet<'Tag> =
          LongSet.Singleton (int element)
          |> retype
  
      /// Returns a new set with an element added to the set.
  
negative.code:         // Preconditions
          checkNonNull "set" set
  
          set.Add (int64 key)
          |> retype
  
      /// Returns a new set with the given element removed.
  