Christian Heimes <li...@cheimes.de> added the comment:

I thought of a version field, too. In the end it is going to cause more work 
and trouble than it would benefit us.

Stack-allocated Py_buffer's are typically initialized with

   Py_buffer data = {NULL, NULL};

. The code initializes Py_buffer.buf and Py_buffer.obj as NULL. The remaining 
fields are whatever random values happens to be on the C stack. If we would 
append a version field to the struct, than every project would have to 
initialize the field properly.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue45459>
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