'ambiwidth' and unicode subscripts

I think this is a bug. With ambiwidth=double, the unicode character '₀' (U+2080, the subscript '0') is single-width, but '₁-₉' (U+2081-U+2089, subscripts 1-9) are double-width.

From my reading of http://unicode.org/reports/tr11/, none of these characters should be considered to be of ambiguous width (they should all be single-width).

(I apologize if this is the wrong place to report bugs. I was directed here by http://sourceforge.net/tracker/?atid=391887&group_id=27891)

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