Issue #12856: Ensure child processes do not inherit the parent's random seed for filename generation in the tempfile module.
Patch by Brian Harring.

Issue #13458: Fix a memory leak in the ssl module when decoding a certificate with a subjectAltName.
Patch by Robert Xiao.

POSIX semaphores (among which FreeBSD < 8).

Add tests for PyUnicode_EncodeDecimal()

raised when the wrapped raw file is non-blocking and the write would block.
Previous code assumed that the raw write() would raise BlockingIOError, but
RawIOBase.write() is defined to returned None when the call would block.
Patch by sbt.

Patch written by Arfrever Frehtes Taifersar Arahesis.

#4147: minidom's toprettyxml no longer adds whitespace around a text node when it is the only child of an element.  Initial patch by Dan Kenigsberg.

invalid hex escape sequences.

(the encoder already accepts them).

It doesn't matter if imp.find_module() fails with ImportError or IOError, but
it should not crash.

Remove a sleep to fix transient test failures. Use skewfactor of -3 to
make it work on systems that have 1 second precision for time.time().

Closes #11999
Refs #13254

"recursive-include" directive now recognizes both legal path separators.

Issue #12875: explicitly specify default value of the optional 'flags' argument to re.* functions. Closes #12875