STINNER Victor <vstin...@redhat.com> added the comment:

> newsize <<= 1; // The largest possible value is PY_SSIZE_T_MAX + 1. 

Previously, there was a explicitly check for error raising  PyErr_NoMemory() on 
overflow. Now you rely on PyMem_Malloc() to detect the overflow. I'm not sure 
that it's a good idea.

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<https://bugs.python.org/issue1621>
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