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[no subject]

I guess I don't see this possible-digitness as being interesting. "[" is
a possible digit in Base-37. Eg, in teco, doing 37u..E37= will display
a '[' ... If you pick a large enuf base, you have to increase your range
of characters to represent digits. Something that just tells you what digit
a character would represent is no more a predicate than the ever-controversial
TYPEP 'predicate'. Just because you artificially cut things off at 26 or 36
doesn't really change anything.