[Cython] Overflow semantics in pure Python mode

[Stefan Behnel]

Willem Broekema wrote:
> In Pure Python mode, code compiled (using annotations) to C should run
> equivalent to running (ignoring annotations) in the Python
> interpreter. That implies that a variable declared as cython.int may
> not rely on overflow behavior, as Python would automatically make a
> long object for such a result. And the same also holds for the other
> numeric types, from char to longlong. Right?

Yep, developers should avoid writing broken code. :)

Stefan