This Unicode Standard Annex will be updated for Unicode 7.0. The
    proposed update is now available for general public review and
    comment.
The exception list for SpacingMark has been updated for Unicode 7.0.
    That list excludes specific characters from being assigned the
    Grapheme_Cluster_Break property value SpacingMark by default.  
Please see the PRI page for details and instructions on how to
    review this issue and provide comments:
      http://www.unicode.org/review/pri265/
