anchor.diff:          let list = List.map mapper address.Names
           Address.make list
   
  -    /// Filter the elements of an address.
  +    /// Filter the names of an address.
       let filter predicate address =
           let list = List.filter predicate address.Names
           Address.make list
  
positive.code:     let fold folder state address =
          List.fold folder state address.Names
  
      /// Take an address composed of the elements of an address minus a skipped amount of elements.
      let skip n address =
          Address.make <| List.skip n address.Names
  
      /// Take an address composed of the given number of elements of an address.
      let take n address =
          Address.make <| List.take n address.Names
  
      /// Take the last element of an address.
      let last address =
          List.last address.Names
  
      /// Take an address composed of all but the last element of an address.
      let allButLast address =
          Address.make <| List.allButLast address.Names
  
      /// Get the length of an address by its elements.
      let length address =
          List.length address.Names
  
      /// Query that an address is devoid of elements.
      let isEmpty address =
          List.isEmpty address.Names
negative.code:     let tail address =
          Address.make <| List.tail address.Names
  
      /// Take a name of an address.
      let at index address =
          List.at index address.Names
  
  