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Thanks for your highly constructive email. I'd be quite happy then to support the addition of just one single new Unicode character then (instead of six) - as in your ligature idea, which above I called DIGIT COMBINING LIGATURE. This would seem to solve everything (pending your answer to my proviso).
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Actually, a PLUS TEN modifier would do the job just as well, and in fewer characters. So hex thirteen could be (U+0033, PLUS_TEN). (I think you suggested that first, but I wasn't paying close enough attention and missed it).
This doesn't actually close the door to radix-64 altogether - it just means that digit 42 would have to be represented as (U+0032, PLUS_TEN, PLUS_TEN, PLUS_TEN, PLUS_TEN). I don't know if modifiers are allowed to combine like that, but (1) it's really only radix sixteen I'm interested in anyway, and (2) if it doesn't work then DIGIT COMBINING LIGATURE is still a good idea.
Jill
