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@@ -1160,6 +1160,9 @@ module ActionController #:nodoc:
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       def reset_session #:doc:
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         request.reset_session
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         @_session = request.session
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+        #http://rails.lighthouseapp.com/projects/8994/tickets/1558-memory-problem-on-reset_session-in-around_filter#ticket-1558-1
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+        #MRI appears to have a GC related memory leak to do with the finalizer that is defined on CGI::Session 
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+        ObjectSpace.undefine_finalizer(@_session)
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         response.session = @_session
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       end
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