I don't think there's an easy way to do this at the moment.
I think either Mocha would need to keep a better handle on what
methods are being stubbed or you'd have to look for the original
hidden (i.e. renamed) versions of methods.
Out of curiosity, why do you want this functionality - it would be
interesting to see a real example of why it would be useful.
I've referenced your message from a ticket  in Lighthouse, because
I think it's related to the idea of un-stubbing.
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