My guess would be that it's done to prevent errors when you re-bless an object into another package, which is valid, but not usually considered good style and can break subclassing if you're not prepared.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re: Simple question about Inside-Out objects by Joost
in thread Simple question about Inside-Out objects by blazar

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