Comment #4 on issue 1908 by Vinzent.Steinberg: mutable core
http://code.google.com/p/sympy/issues/detail?id=1908
I don't think it would be only useful for '+='-style operations. If we have
Add(x, y, z) + Add(x, a)
and would use dictionaries instead of tuples for args, we could merge the
the two
dicts more efficiently (reusing the first or second add) than by just
recreating a
tuple, if I understand it correctly.
But please feel free to clarify how an efficient implementation can be
achieved
without mutability.
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