[issue6632] Include more fullwidth chars in the decimal codec

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

I wonder if the issues raised here can be neatly addressed by applying NFKC normalization before string to number conversion.  This will convert full-width variants to ASCII and also eliminate digit/decimal differences.  For example superscript and subscript variants will be converted to ASCII.  Note that NFKC normalization is already applied to identifiers, so its effect should be familiar to users.

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<http://bugs.python.org/issue6632>
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