Determining the underlying implementation of an object

[Jonathan Watt]

According to www.mozilla.org/scriptable/faq.html#i12 , when a native 
method called from Javascript expects nsIFoo but gets passed a JS object 
such as {} or [], the JS object gets wrapped as if it implemented the 
required interface. Is it possible for the native C++ code to detect 
that it doesn't have a genuine nsIFoo so it can enforce the requirement 
that objects passed to it be genuine nsIFoo objects. Or to do this would 
the xpconnect code need to be changed somehow?

Thanks,
Jonathan
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