Pardon my asking, as this is not my specialty:
There are several other ligatures that *should* be formed (automatically) by "run of the mill" fonts: for instance the "fj" ligature, just to mention one that I find particularly important (and that does not have a compatibility code point).
About the "should" - isn't this language-dependent? For example I recall that ordinary German print literature barely uses any ligatures at all these days (ie: I'm not talking about historical texts). And, has anyone ever attempted to catalogue such ligature practices? (Is this suitable for CLDR?)
(I also recall being taken aback by the odd look of ligatures in many LaTeX-typeset English scientific documents, but I suspect that's rather because some of the commonly used fonts there are lacking in aesthetic design.)
Stephan

