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Display modes

The TUI adapts to the terminal it lands on: glyphs follow the locale (a UTF locale in LC_ALL, LC_CTYPE or LANG enables Unicode; anything else falls back to ASCII) and color honors NO_COLOR and TERM=dumb. You can force either on the Tui facade with ->unicode(TRUE|FALSE) and ->color(TRUE|FALSE). Here's the same produce-box form in each combination:

ANSINo ANSI
UnicodeProduce box: Unicode + ANSIProduce box: Unicode + ANSIProduce box: Unicode + No ANSIProduce box: Unicode + No ANSI
ASCIIProduce box: ASCII + ANSIProduce box: ASCII + ANSIProduce box: ASCII + No ANSIProduce box: ASCII + No ANSI

The forcing seams and the environment conventions each have a runnable script in playground/11-display-modes-*.