*enter()/*exit()
  calls.
"enter"(this, ..., indent=this$indentStep, sep="", suffix="...", level=this$defaultLevel) "enterf"(this, fmtstr, ..., indent=this$indentStep, sep="", suffix="...", level=this$defaultLevel)sprintf() format string, which together with
   ... constructs the message.character string.character string to be appended to the end of the message.numeric value to be compared to the threshold.Verbose.