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Thanks to Nadeem Vawda for the find and an initial fix.

Various tests fail when run under coverage. A primary culprit is refcount tests
which fail as the counts are thrown off by the coverage code. A new decorator
-- test.support.refcount_test -- is used to decorate tests which test refcounts
and to skip them when running under coverage. Other tests simply fail because
of changes in the system (e.g., __local__ suddenly appearing).

Thanks to Kristian Vlaardingerbroek for helping to diagnose the test failures.

called collections.abc, following the pattern used by importlib.abc.  For
backwards compatibility, the names continue to also be imported into the
collections module.

4GB, even on 32-bit builds.  Initial patch by Ross Lagerwall, adapted for
32-bit Windows.

to open door files.

Issue #10830: Fix PyUnicode_FromFormatV("%c") for non-BMP characters on
narrow build.

Issue #11168: Remove filename debug variable from PyEval_EvalFrameEx().
It encoded the Unicode filename to UTF-8, but the encoding fails on
undecodable filename (on surrogate characters) which raises an unexpected
UnicodeEncodeError on recursion limit.

Issue #11169: compileall module uses repr() to format filenames and paths to
escape surrogate characters and show spaces.

Issue #11187: Remove bootstrap code (use ASCII) of
PyUnicode_AsEncodedString(), it was replaced by a better fallback (use
the locale encoding) in PyUnicode_EncodeFSDefault().

Prepare also empty sections in NEWS.

package had previously been installed.

with large config files.

Many tests simply didn't care if they unset a pre-existing trace function. This
made test coverage impossible. This patch fixes various tests to put back any
pre-existing trace function. It also introduces test.support.no_tracing as a
decorator which will temporarily unset the trace function for tests which
simply fail otherwise.

Thanks to Kristian Vlaardingerbroek for helping to find the cause of various
trace function unsets.

larger than 4GB.  Patch by Nadeem Vawda.

#11249: in PyType_FromSpec, copy tp_doc slot since it usually will point to a static string literal which should not be deallocated together with the type.

#941346: Fix broken shared library build on AIX. Patch by Sebastien Sable, review by Antoine Pitrou.

Reviewed by Georg Brandl.

Reviewed by Georg Brandl.

OS X installers no longer includes an Extras directory.  The Tools
directory is now installed in the framework under share/doc.

Issue 10971: Make test_zipimport_support once again compatible with refleak hunting (reviewed by Georg Brandl)

in the limited ABI

would lead to a decref of a NULL.

Fixes issue #11110.

Patch by Stan Mihai. Ok'ed by Georg.

Patch by Ron Adam, reviewed by Eric Araujo.

Although this patch contains API changes and is rather weighty for an
RC phase, the mailbox module was essentially unusable without the patch
since it would produce UnicodeErrors when handling non-ascii input
at arbitrary and somewhat mysterious places, and any non-trivial amount
of email processing will encounter messages with non-ascii bytes.
The release manager approved the patch application.

The changes allow binary input, and reject non-ASCII string input early
with a useful message instead of failing mysteriously later.  Binary
is used internally for reading and writing the mailbox files.  StringIO
and Text file input are deprecated.

Initial patch by Victor Stinner, validated and expanded by R. David Murray.

Issue #10845: Improve compatibility between multiprocessing on Windows and package, zipfile and directory execution (Reviewed by Antoine Pitrou and approved by Georg Brandl)