- Issue #21088: Bugfix for curses.window.addch() regression in 3.4.0.
In porting to Argument Clinic, the first two arguments were reversed.
+- Issue #21469: Reduced the risk of false positives in robotparser by
+ checking to make sure that robots.txt has been read or does not exist
+ prior to returning True in can_fetch().
+
- Issue #21321: itertools.islice() now releases the reference to the source
iterator when the slice is exhausted. Patch by Anton Afanasyev.