Comment #20 on issue 3086 by [email protected]: round() function overrides
built-in
http://code.google.com/p/sympy/issues/detail?id=3086
There is a sympy object, Number, from which Float, Integer, Rational and
+/-Infinity derive. Things which evaluate to a Number are not necessarily
Numbers themselves, e.g. `sqrt(3) + 2` is an Add object, not within the
scope of (not an instance of) Number.
>>> sqrt(3).is_number
True
>>> sqrt(3).is_Number
False
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