Currently, the width of the header text is not taken into consideration when drawing the table. The width of the header text must be accounted for as if it were an ordinary row. Specifically, the following error occurs otherwise:
PHP Warning: str_repeat(): Second argument has to be greater than or equal to 0 in /home/joshua/workspace/github.com/phacility/libphutil/src/console/PhutilConsoleTable.php on line 211