Now there was the authoritative source that claims there was originally a single vowel followed by a small or big noon. I consulted another authoritative source, Dr Gerd-Rüdiger Puin, researcher into the history of Qur'anic orthography, and he confirmed my observation that the oldest manuscripts express tanween with two, horizontally aligned vowel signs. This is also how Yasin Dutton describes them - no trace of a small noon, let alone a big one.
formula:
[vowel <a/u/i>]+[any tanween <regular/iqlaab/idgaam> (as many as you can identify; these are the three expressed in the Saudi orthography, AFAIK)
This structure guarantees searching in existing Unicode-enabled environments. It also guarantees that modern font technology can take care of the shapes, whether Pakistani , Egyptian, Saudi or North African. This approach would mean that on the level of plain text code, Qur'ans remain identical when they do not conceptually differ and it would make research into real differences much more efficient.
A simple canonical equivalence insures legacy compatibility with existing fathatan, dhammatan and kasratan.
t
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