Issue #3217 has been updated by Yui NARUSE.

Category set to M17N
Status changed from Assigned to Rejected

This is feature change on Ruby 1.9.
http://www.unicode.org/reports/tr18/

And redcloth3's exapmle is a bug, they should use their PUNCT constant.
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http://redmine.ruby-lang.org/issues/show/3217

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http://redmine.ruby-lang.org