Issue #1836 has been updated by Run Paint Run Run.


> So your new behaviour would be consistent with that. Whether that's the desired behaviour is not really 
> for me to decide.

It was decided in http://redmine.ruby-lang.org/issues/show/1550 that no-ops on frozen objects should raise RuntimeErrors. :-)
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http://redmine.ruby-lang.org/issues/show/1836

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