Comment #1 on issue 2475 by asmeurer: primitive should use Add, not _new_rawargs
http://code.google.com/p/sympy/issues/detail?id=2475
Pull 322 may make this irrelevant, but we should still document this gotcha in the _new_rawargs docstring, and also it might be a good idea to double check the places in the code that use _new_rawargs to make sure they won't reorder the args.
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