The fun thing is that Tcl/Tk got Unicode essentially nailed more than 10 years ago (in version 8.2, to be exact), and transparently at that. None of those flag-day incompatibilities that seem to haunt the Python world. In Tcl there is no notion of separate »byte strings« and »Unicode strings«. Things just work. Most of the other languages that have been around for about as long (e.g., Perl or Python) are still struggling.
People may not like the Tcl language a lot (it is a bit of an acquired taste, to be sure) but much of the underlying engineering is really very good indeed.
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