(cherry picked from commit 7750bded)

(cherry picked from commit fd0fa674)

`kargs` -> `kwargs`
(cherry picked from commit d505a29a)

(cherry picked from commit 6e3d6b5d)

(cherry picked from commit 43605e6b)

bpo-32011: Revert "Issue GH-15480: Remove the deprecated and unused TYPE_INT64 code from marshal." (GH-4381) (#4405)

Simplify the reverted code.

This reverts commit e9bbe8b8.
(cherry picked from commit 00987f62)

[3.6] bpo-31949: Fixed several issues in printing tracebacks (PyTraceBack_Print()). (GH-4289) (#4406)

* Setting sys.tracebacklimit to 0 or less now suppresses printing tracebacks.
* Setting sys.tracebacklimit to None now causes using the default limit.
* Setting sys.tracebacklimit to an integer larger than LONG_MAX now means using
  the limit LONG_MAX rather than the default limit.
* Fixed integer overflows in the case of more than 2**31 traceback items on
  Windows.
* Fixed output errors handling..
(cherry picked from commit edad8eeb)

(cherry picked from commit 6545256d)

(cherry picked from commit 3bda0222)

(cherry picked from commit b0b44b4b)

* bpo-32015: Asyncio cycling during simultaneously socket read/write and reconnection

* Tests fix

* Tests fix

* News add

* Add new unit tests.
(cherry picked from commit e1d62e0b)

(cherry picked from commit 28b62482)

(cherry picked from commit 56935a53)

(cherry picked from commit f76231f8)

(cherry picked from commit 92c2ca76)

(cherry picked from commit e0582a37)

(cherry picked from commit e197a853)

It can be removed after https://github.com/python/peps/commit/c28890fb421c906241da6da718f9eacc5a3109ee
(cherry picked from commit 7c9da3e5)

(cherry picked from commit e184cfd7)

(cherry picked from commit 5e0df74b)

(cherry picked from commit 191e9933)

* Fix compilation of the socket module on NetBSD 8.
* Fix the assertion failure or reading arbitrary data when parse
  a AF_BLUETOOTH address on NetBSD and DragonFly BSD.
* Fix other potential errors and make the code more reliable.
(cherry picked from commit d3187158)

(cherry picked from commit 01ae58d4)

(cherry picked from commit 0de92859)

bpo-31620: have asyncio/queues not leak memory when you've exceptions during waiting (GH-3813) (#4326)

(cherry picked from commit c62f0cb3)

(cherry picked from commit 5a66c8a6)

* bpo-31970: Reduce performance overhead of asyncio debug mode..
(cherry picked from commit 921e9432)

(cherry picked from commit 22b11285)

* fix doc for multiprocessing.connection.Client

The authenticate argument does not exist on either Client or Listener:
- https://github.com/python/cpython/blob/master/Lib/multiprocessing/connection.pyGH-L483 (master)
- https://github.com/python/cpython/blob/3.6/Lib/multiprocessing/connection.pyGH-L478 (3.6)
- https://github.com/python/cpython/blob/3.5/Lib/multiprocessing/connection.pyGH-L478 (3.5)
- https://github.com/python/cpython/blob/3.4/Lib/multiprocessing/connection.pyGH-L487 (3.4)
The documentation also claimed that these functions will call `current_process().auth_key`, for which I could find no evidence in the code. I rewrote the documentation to reflect the actual behavior.

Also made some small changes to vary sentence structure.
(cherry picked from commit 1e5d54cf)

By accident the size of the empty dict keys object matched the
size of values array.
(cherry picked from commit 39a156c5)

(cherry picked from commit cb04f751)

(cherry picked from commit 4135c893)

bpo-31764: Prevent a crash in sqlite3.Cursor.close() in case the Cursor object is uninitialized (GH-3958) (#4303)

(cherry picked from commit edb13ae4)

bpo-31770: Prevent a crash and refleaks when calling sqlite3.Cursor.__init__() more than once (GH-3968) (#4301)

(cherry picked from commit e56ab746)

Manual partial backport of patch that fixed nearly 50 other files.

(cherry picked from commit aed08562)

(cherry picked from commit 0d2a9088)

(cherry picked from commit aafece7a)