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Some languages have problems with f-ligatures. One example is German, where ligatures across Wortfugen can be a source of confusion; another is Turkish, in which the dotless ı requires special treatment.
Have there been any efforts to identify (and compile a list of) such problems, and is it considered good practice to code those exceptions as language-specific OpenType alternates? Say, "ligatures for dflt, no ligatures for german"? Or would that go against users' expecations? How well are such features implemented in software at all?
Another solution, of course, is a Linotype ("Sabon") f, but you know, I do have a thing for nice fi and fl ligatures :)