supported by Doc/Makefile, as well as a bit of modernization,
cleanup, and notes about the difference between Unix and Windows.

Issue #21321: itertools.islice() now releases the reference to the source iterator when the slice is exhausted.

Patch by Anton Afanasyev.

Issue #21321: itertools.islice() now releases the reference to the source iterator when the slice is exhausted.

Patch by Anton Afanasyev.

Issue #21057: TextIOWrapper now allows the underlying binary stream's read() or read1() method to return an arbitrary bytes-like object (such as a memoryview).

Patch by Nikolaus Rath.

Issue #20951: SSLSocket.send() now raises either SSLWantReadError or SSLWantWriteError on a non-blocking socket if the operation would block. Previously, it would return 0.

Patch by Nikolaus Rath.

fix isuse #13248: remove previously deprecated asyncore.dispatcher __getattr__ cheap inheritance hack.

Patch by Muhammad Jehanzeb.

Issue #9815: assertRaises now tries to clear references to local variables in the exception's traceback.

Issue #9815: assertRaises now tries to clear references to local variables in the exception's traceback.

Issue #20355: -W command line options now have higher priority than the PYTHONWARNINGS environment variable.  Patch by Arfrever.

Patch by David Bolen.

Issue #21312: Update the thread_foobar.h template file to include newer threading APIs.  Patch by Jack McCracken.

Issue #19940: ssl.cert_time_to_seconds() now interprets the given time string in the UTC timezone (as specified in RFC 5280), not the local timezone.

Patch by Akira.

Merge 3.4 -> default: asyncio: Add __weakref__ slots to Handle and CoroWrapper. Upstream issue #166.