Issue #6629: Fix a data corruption issue in the new `io` package, which could
occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
"wb+" mode) after having buffered a certain amount of data for reading. This
bug was not present in the pure Python implementation.
Yes, this is a serious issue.
diff --git a/Misc/NEWS b/Misc/NEWS
index 9fd2a51..48c58fb 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -354,6 +354,11 @@
Library
-------
+- Issue #6629: Fix a data corruption issue in the new `io` package, which could
+ occur when writing to a BufferedRandom object (e.g. a file opened in "rb+" or
+ "wb+" mode) after having buffered a certain amount of data for reading. This
+ bug was not present in the pure Python implementation.
+
- Issue #4660: If a multiprocessing.JoinableQueue.put() was preempted, it was
possible to get a spurious 'task_done() called too many times' error.