Expand description
Returns an estimate of the worst-case display width in milli-m’s (thousandths of the
the width of an m character).
For example, width('m') returns 1000, width('i') returns 600, and width('\u{FDFD}')
returns 10300 (wouldn’t you like to know if your user’s text is 10.3X longer per character
than you might have expected?).
Precision is not necessarily 1 milli-m (currently, it is 100 milli-m’s).