Prevent import subsystem stack frames from being counted by the warnings.warn(stacklevel=) parameter.
Prevent __class__ assignment to immutable built-in objects.
Fix AST compilation for PEP 448 syntax.
time_strftime() buffer over-read.
To resolve a compatibility problem found with py2exe and pywin32, imp.load_dynamic() once again ignores previously loaded modules to support Python modules replacing themselves with extension modules. Patch by Petr Viktorin.
Fixed a bug in typing.py where isinstance([], typing.Iterable) would return True once, then False on subsequent calls.
Fixed buffer overread in BytesIO.readline() if a position is set beyond size. Based on patch by John Leitch.
Fix overrun error in deque.index(). Found by John Leitch and Bryce Darling.