Issue #2443 has been updated by Marc-Andre Lafortune.

Category set to core

Interesting. Clearly this is not intentional.

I feel that obj.is_a?(BasicObject) should be expected to return true for any obj and that BasicObject.clone should raise an error. The same should be true for Object in 1.8.
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http://redmine.ruby-lang.org/issues/show/2443

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