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# Seems supported in $TERM_PROGRAM_VERSION 370
> cat superxterm
# A xterm-256color based TERMINFO that adds the escape sequences for italic.
xterm-256color|xterm with 256 colors and italic,
  sitm=\E[3m, ritm=\E[23m,
  use=xterm-256color,
> tic superxterm
> tput sitm; echo italics