      \fitem{lace}{(t:tab, n:numeric)} returns a new tab whose elements
      are interlaced sequences of the elements of the \code{t}
      subcollections, up to size \code{n}. The receiver is unchanged.
      \begin{lstlisting}
            @lace([[1, 2, 3], 6, ["foo", "bar"]], 9) == [1, 6, "foo", 2, 6, "bar", 3, 6, "foo"]
      \end{lstlisting}

      %%% -------------------------------------------------------

