Updates:
Status: Fixed
Comment #3 on issue 2046 by asmeurer: return self if expr is None else expr
-- are we ditching 2.4?
http://code.google.com/p/sympy/issues/detail?id=2046
I also accidentally re-added SymTuple, but that has also been fixed. For
the subs_atoms patch itself, let's make that issue 2047.
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