Issue #1165 has been updated by ujihisa ..


Current documentations don't mention about a subclass of Range.
http://www.ruby-doc.org/core/classes/Range.html#M000690
http://doc.okkez.net/191/view/method/Range/i/=3d=3d

Actually the Japanese one was fixed not to mention about a subclass of Range in May. http://redmine.ruby-lang.org/issues/show/1446
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http://redmine.ruby-lang.org/issues/show/1165

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