Unicode/UTF-8 support appeared in Tcl/Tk 8.1, which came out in April 1999, i.e., nearly 15 years ago. It is worth noting that Unicode in Tcl worked quite well pretty much from the point when it was ...
I wouldn't be so quick to claim that there are never character set or encoding related bugs in Perl or Tcl applications as a direct result of DWIM not always doing the _right_ thing. Perhaps not ...