Originally Posted by ShellShock
Curiously when I tried Fontin, it would show blank for "ff" (two characters), which made me suspect that the Kobo is converting to ligatures on the fly.
From what I remember seeing in discussions about ligatures in unicode font sets and why the fj ligature which is found in a couple of English loan words was not supported, the consensus was that ligatures should be supported in software and not in the font itself.
Using the example of officer, I don't find that much in the line of esthetic appeal from using the ff or ffi ligatures instead of f f i -- just noticed that my web browser is using ligatures for ff and ffi. The only two ligatures I really noticed in ebooks was in one book where the author used macron-AE and macron-OE characters in some character names. At that time I hadn't added any fonts on my Kobo so I saw either empty box tesk or box with question mark tesk for two of the character names which was more than a bit confusing when they were both in a scene.