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Thanks Raymond, I was not aware of dict.__init__'s updating capabilities 
when I wrote the patch, and I agree that making the two equivalent is 
indeed the right solution.  Implementation wise, I believe the right 
answer would be to refactor the code such that dict.__init__ calls (the 
new) dict.update, not vice versa, for clarity's sake.

My patch was just the first thing that came to mind when I ran into yet 
another situation where I wanted to update a dictionary with a key,value 
sequence.