This appears to have been a mixup introduced when we switched from
'expected/actual' to 'first/second'.  The problem doesn't exist
in the corresponding assertCountEqual method in Python3.

The behaviour of the parse_constant callback changed insofar that 'null',
'true', 'false' don't trigger its call anymore.

Patch by Serhiy Storchaka

undecoded UTF-8 bytes as a string when accessing the Tk clipboard.
Modify clipboad_get() to first request type UTF8_STRING when no
specific type is requested in an X11 windowing environment, falling
back to the current default type STRING if that fails.
Original patch by Thomas Kluyver.

This patch also clarifies the definition of Naive and Aware.

Original patch by Greg Weller, I modified the first hunk
somewhat to make the exposition even clearer (I hope).

Patch by Hynek.

support chflag operations.  (Patch by Hynek Schlawack)

Patch by Hynek Schlawack.