numeric properties of Nl characters in the UCD

From: Philippe Verdy (verdy_p@wanadoo.fr)
Date: Sat Nov 22 2003 - 21:57:37 EST

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    I do understand why number letter characters with "Nl" general category
    don't have a "decimal value" property or a "integer value" property, but why
    they don't all have a "numeric value" property in the UCD. Notably these two
    ones:

    2183;ROMAN NUMERAL REVERSED ONE HUNDRED;Nl;0;L;...
    1034A;GOTHIC LETTER NINE HUNDRED;Nl;0;L;...

    Why don't they have the numeric value properties 100 and 900? Is that
    because their value is not sure, and may not be the one assumed by their
    assigned and normative name?

    The other exception is for a No (number other) character:
    09F8;BENGALI CURRENCY NUMERATOR ONE LESS THAN THE DENOMINATOR;No;0;L
    but it's obvious that its value (n-1) depends on another number n whose
    value is not known and not representable in the UCD field.

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