Revert r83395, it introduces test failures and is not necessary anyway since we now have to nul-terminate the string anyway.

reads on a BZ2File object, rather than returning incorrect results.

where 'id -G' and posix.getgroups() returned the same information,
but one of the sources contains duplicate information. Rewrite the
check using sets instead of lists.

re-initializing a buffered IO object by calling its `__init__` method.

don't cause a crash on Windows.

output with no type specifier failed to match the str output:

  - format(complex(-0.0, 2.0), '-') omitted the real part from the output,
  - format(complex(0.0, 2.0), '-') included a sign and parentheses.

#8826: the "expires" attribute value is a date string with spaces, but apparently not all user-agents put it in quotes.  Handle that as a special case.

#8821: do not rely on Unicode strings being terminated with a \u0000, rather explicitly check range before looking for a second surrogate character.

Small improvements to pstats browser: do not crash on reading invalid file, and actually do a reload when executing "read" as intended.

#7395: fix traceback in do_add() when no stats are loaded.  Apply same fix for do_sort() and do_reverse().

Build properties using lambdas.  This makes test_pyclbr pass again, because it does not think that input and output are methods anymore.

Cmd used to blindly chop off the last character of every input line.  If
the input reached EOF and there was no final new line, it would truncate
the last character of the last command.  This fix instead strips trailing
\r\n from the input lines.  While this is a small behavior change, it
should not break any working code, since feeding a '\r\n' terminated
file to Cmd would previously leave the \r's on the lines, resulting
in failed command execution.

I wrote the unit test in preparation for a PyOhio TeachMe session
run by Catherine Devlin, and we can thank Catherine and the PyOhio
session attendees for the fix.  I've added Catherine to the Acks file
for organizing and leading the TeachMe session, out of which we will
hopefully get some new contributors.