gh-156939: Clear newly allocated bytes in PyBytesWriter_Resize() - #157455
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Adjust the logic to set newly allocated bytes to a known pattern (PyBytesWrite_NEW_BYTE). Only copy 'size' bytes from the small buffer to the new bytes/bytearray object.
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Adjust the logic to set newly allocated bytes to a known pattern (PyBytesWrite_NEW_BYTE). Only copy 'size' bytes from the small buffer to the new bytes/bytearray object.