Cross-version extension modules?

[Peter Astrand]

If I build a extension module with Python 2.2 and then loads it with 2.3, 
I get:

RuntimeWarning: Python C API version mismatch for module _foo: This
Python has API version 1012, module _foo has version 1011.

How fatal is this? Is it safe to use the module anyway? If not, is it
possible to build the module differently, so that it actually is safe to
use it with different versions of Python?

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