Originally Posted by Doitsu
BTW, Python-challenged ebook designers could simply compile an epub with KindlePreviewer/KindleGen and have a look at the detected Unicode ranges in the log file.
I think that getting the ranges isn't fine grained enough. We're not wanting to check that our fonts cover the characters used, but to trim the fonts to cover only the characters used. Of course, making sure that all the needed characters are in the font will be part of this.