gh-156939: Detect PyBytesWriter buffer overflow earlier - #157385
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Check the canary byte in all PyBytesWriter methods, not only in PyBytesWriter_Finish(). Add a discard() method to the _testcapi wrapper.
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Check the canary byte in all PyBytesWriter methods, not only in PyBytesWriter_Finish().
Add a discard() method to the _testcapi wrapper.