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by jake-low 3052 days ago
I don't think any languages make use of İ but not ı; perhaps when you press the İ key on your keyboard the actual character sequence that gets entered is the decomposition "LATIN CAPITAL LETTER I (U+0049) COMBINING DOT ABOVE (U+0307)"? OpenType has tags that allow you to describe where arbitrary combining diacritics go relative to a glyph, so maybe the font knows how to assemble those two code points into an İ, even though the font designer didn't explicitly design for Turkish. Just speculating here.