Are you sure that SymPy's behaviour is well-defined?
In [1]: z = Symbol('z', imaginary=True)
In [2]: z.is_imaginary
Out[2]: True
In [3]: z.is_real
Out[3]: False
In [4]: limit(1/z, z, 0)
Out[4]: ∞
In [5]: type(_)
Out[5]: sympy.core.numbers.Infinity
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