NB: implementation details and format of the summary are subject to
change in future releases print.tfl works similar to the standard print method for
data frames, but provides additional information about $N$ and
$V$. Unless all is set to TRUE, only the twenty
most frequent types will be shown.
summary.tfl gives a concise summary of the most important
information about the type frequency list. In addition to showing
$N$ $V$, the summary also indicates whether the list is
incomplete and shows examples of type representations (if present).