From: Jeremy Kemper Date: 2009-07-31T09:07:27+09:00 Subject: [ruby-core:24631] [Bug #1844] Immediates Should Not Respond to :dup Issue #1844 has been updated by Jeremy Kemper. Hongli, respond_to? may not be reliable in the case of proxy objects. Also, calling respond_to? adds an implicit API requirement that simply calling the method does not. For example: http://github.com/rails/rails/commit/78af2710695973bbd747738d175fb3b1f488df6c ---------------------------------------- http://redmine.ruby-lang.org/issues/show/1844 ---------------------------------------- http://redmine.ruby-lang.org