You can invoke it by adding `--remove-hints` as an argument.
This may improve the appearance of certain fonts on Kobo devices with
high resolution displays. Might make a difference for 300 DPI and up,
at 12 pt font sizes and above.
For the upcoming update to the KF collection of fonts, this flag will
likely be used for all fonts or at the very least for a selection of
fonts that benefit from TrueType hints being absent.
