In ExprNodes.py there are several places where method `as_none_safe_node` was applied in order to wrap a node by NoneCheckNode. I think it would be resonable to apply that mostly only in cases when noncheck=True.
Here are possible changes in ExprNodes.py: https://github.com/intellimath/cython/commit/bd041680b78067007ad6b9894a2f2c18514e397c Zaur Shibzukhov
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