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XmlBuilder objects (and maybe some others) strip away the default methods from their instances, including such basics as equality. This can crash the debugger if it tries to display one of these objects. More details here: http://rails.lighthouseapp.com/projects/8994-ruby-on-rails/tickets/909 I consider this a Rails bug, but the maintainers don't.
Will take a look at it after move to new backends. Thanks for filing.
Needs to be fixed in the backend, I'll take a look and file an issue against the backend.