Has anyone used Tcl for LLM prompt control?
I haven't coded TCL in something like 20 years; at the time Unicode support in TCL was non-existent; a quick review of modern TCL forums looks like UTF-8 support is not wart-free, and UTF-16 support is not on the table.
I used TCL on top of AOLServer, and at its best, it really did give that "you have superpowers" feeling Lisp can give an engineer. I bet it would make a very comfortable environment for experimenting. So much of modern LLM experimentation could be seen as creating DSLs for different tasks: TCL excels at this.
This is configurable, though -- I recall it was a preprocessor define in the C code, and you can change it to 32 bits per character, making it UTF-32. Of course, this won't help a Tcl script run somewhere else, but it means you _can_ build a Tcl interpreter that transparently works with "all unicode", at the cost of doubling memory consumption for every string.
All this is concerning the internal string format, not what it accepts as input/output.