Martin v. Löwis <mar...@v.loewis.de> added the comment: A problem can only occur if you preserve a pointer to the buffer, and the object gets a chance to change its buffer underneath. This can happen when there are user-defined callback, and when other threads can get control. In the cases being fixed, other threads *can* get control, as the GIL is released. In the cases you discuss, this cannot happen, since the GIL is not released, and no codepath can lead to buffer reallocation.
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