Originally Posted by kovidgoyal
It isn't that simple. Run calibre on windows XP or linux with your font and you will see the stars becoming too big.
I cannot speak for Linux, but I suppose there still millions of users still using a copy of Windows XP which was released to manufacture in August 2001. Microsoft have said Extended Support for XP will continue until April 2014, so until then, there is probably little prospect of the numbers diminishing appreciably. Meanwhile, developers such as yourself must continue to support it also.