Contains currently:
cli_unicode_option: whether thecli.unicodeoption is set and its value. Seeis_utf8_output().symbol_charset: the selected character set for symbol, UTF-8, Windows, or ASCII.console_utf8: whether the console supports UTF-8. Seebase::l10n_info().latex_active: whether we are inside knitr, creating a LaTeX document.num_colors: number of ANSI colors. Seenum_ansi_colors().console_with: detected console width.