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Yes, it does look like lookup('') is fixed in CVS.  So the 
question is whether lookup() of something that isn't 
convertable in the current encoding to a char* should raise a 
LookupError.  I can live with it not, though if it did, it would 
make it a bit easier to determine if an arbitrary unicode string 
is a name of a supported encoding.  

I'm willing to put together a patch to raise LookupError if 
that's what the behavior should be