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But for Indic conjuncts it seems to fall back to dividing the ligature evenly, as well as for Arabic ligatures like the allah or la ligature
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Yeah, no, that makes sense. Interestingly, for conjuncts that use half forms it works as well (e.g. न्न्न्न्ह). But most good fonts have all the biconsonantal conjuncts as separate glyphs so those get the fallback, even for ligatures like न्ह which could use the half form.
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