Are there fallback rules for Sinhala consonant clusters? There are fallback rules for Devanagari, but I'm not sure if they read across.
The problem I am seeing is that the Pali syllable 'ndhe' න්ධෙ <U+0DB1 NAYANNA, U+0DCA AL-LAKUNA, 200D ZWJ, U+0DB0 MAHAPRAANA DAYANNA, U+0DD9 KOMBUVA> is being rendered identically to a hypothetical Sinhalese 'nēdha' නේධ <U+0DB1, U+0DDA DIGA KOMBUVA, U+0DB0>, which in NFD is <U+0DB1, U+0DD9, U+0DCA, U+0DB0>, when I use a font that lacks the conjunct. (Most fonts lack the conjunct.) The Devanagari rules and my preference would lead to a fallback rendering as න්ධෙ (Sinhalese 'ndhe'), which is encoded as <U+0DB1 NAYANNA, U+0DCA AL-LAKUNA, U+0DB0 MAHAPRAANA DAYANNA, U+0DD9 KOMBUVA>. Is the rendering I am getting technically wrong, or is it merely undesirable? The ambiguity arises in part because, like the Brahmi script, the Sinhala script uses its virama character as a vowel length indicator. Missing touching consonants are being rendered almost as though there were no ZWJ, but the combination of consonant and al-lakuna is being rendered badly. Richard.
