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I recommend to reject this patch. If such a feature is 
implemented, it should be implemented uniformly across 
platforms - i.e. on Unix, appropriate dlclose calls should 
be issued.

Furthermore, I don't see the problem with the DLLs being 
loaded. AFAIK, each DLL will be loaded only once, so even 
if the interpreter is stopped and started again, you get 
only one copy of the DLLs state per process, right? So 
what is the problem?

Finally, it seems reasonable that people embedding the 
interpreter might need to customize its code. It is 
possible that the finalization procedure of user A won't 
work for user B, e.g. because they require state to 
survive different activations and deactivations.