The RFC doesn't say that they are allowed; apparently many mailers accept
them, but not postfix.  Contributions to this patch were made by Felipe Cruz
and Catalin Iacob.

The changeset also adds additional indirect tests for quoteaddr (null address
and IDNA-encoded address).

Closes #12579. Positional fields with str.format_map() now raise a ValueError instead of SystemError.

Fix Issue10403 - datetime documentation clarification based on review in the reitveld by Alexendar belopolsky.

shutdown() is called, without waiting for the garbage collector to kick in.

Patch by Andreas Stührk.

Patch by Andreas Stührk.

Patch from Andreas Stührk.

embedding Python.  Patch by Andreas Stührk.

test_shutdown() may fail on very slow buildbots like FreeBSD 6.4 just because
of the arbitrary timeout.

as the processor type on some Mac systems.  Also fix NameError in fallback
_mac_ver_gestalt function.  And remove out-of-date URL in docs.

the parent structure. Patch by Vlad Riscutia.

Raise ValueError when attempting to set the _CHUNK_SIZE attribute of a TextIOWrapper to a huge value, not TypeError.

cleared by the garbage collector.  This fixes a segfault when an instance
and its type get caught in a reference cycle, and the instance's
deallocator calls one of the methods on the type (e.g. when subclassing
IOBase).

Diagnosis and patch by Davide Rizzo.

Also, point to the various alternatives.