asyncio: Change mock pipe to mock socket. Hope to fix issue 19750.
asyncio: Hopeful fix for issue 19765.
Issue #19691: remove outdated mention about RuntimeError
Issue #19691: remove outdated mention about RuntimeError
Issue #19742: fix a test_pathlib failure when a file owner or group isn't in the system database
Issue #19739: Try to fix compiler warnings on 32-bit Windows.
#19778: fix a couple of re reprs in the documentation.
Combine _Pickler_FastCall and _Unpickler_FastCall in cpickle.
#13592, #17087: add whatsnew entry about regex/match object repr improvements.
Reverting e39db21df580 eagerly due to buildbot failures.
Issue #19752: Fix "HAVE_DEV_PTMX" implementation of os.openpty()

Regression introduced by the implementation of the PEP 446 (non-inheritable
file descriptors by default).

master_fd must be set non-inheritable after the creation of the slave_fd,
otherwise grantpt(master_fd) fails with EPERM (errno 13).
asyncio: Add StreamReaderProtocol to __all__.
Issue #18874: tracemalloc: explain the purpose of get_traces.tracebacks in a comment
Issue #18874: apply Jim Jewett's patch on tracemalloc doc
Issue #18874: allow to call tracemalloc.Snapshot.statistics(cumulative=True)
with traceback_limit=1
Issue #18874: tracemalloc: Comment the trace_t structure
Issue #18874: make it more explicit than set_reentrant() only accept 0 or 1
Issue #18874: Fix typo
Fix suspicious test case