• Python 3: A monkey-patched :class:threading.RLock now properly
  blocks (or deadlocks) in acquire if the default value for
  timeout of -1 is used (which differs from gevent's default of
  None). The acquire method also raises the same :exc:ValueError
  exceptions that the standard library does for invalid parameters.
  Reported in #750 by Joy Zheng.
• Fix a race condition in :class:~gevent.event.Event that made it
  return False when the event was set and cleared by the same
  greenlet before allowing a switch to already waiting greenlets. (Found
  by the 3.4 and 3.5 standard library test suites; the same as Python
  bug 13502_. Note that the Python 2 standard library still has this
  race condition.)
• :class:~gevent.event.Event and :class:~.AsyncResult now wake
  waiting greenlets in the same (unspecified) order. Previously,
  AsyncResult tended to use a FIFO order, but this was never
  guaranteed. Both classes also use less per-instance memory.
• Using a :class:~logging.Logger as a :mod:pywsgi error or request
  log stream no longer produces extra newlines. Reported in
  #756 by ael-code.
• Windows: Installing from an sdist (.tar.gz) on PyPI no longer
  requires having Cython installed first. (Note that the binary installation
  formats (wheels, exes, msis) are preferred on Windows.) Reported in
  #757 by Ned Batchelder.
• Issue a warning when :func:~gevent.monkey.patch_all is called with
  os set to False (not the default) but signal is still True
  (the default). This combination of parameters will cause signal
  handlers for SIGCHLD to not get called. In the future this might
  raise an error. Reported by Josh Zuech.
• Issue a warning when :func:~gevent.monkey.patch_all is called more
  than once with different arguments. That causes the cumulative set of all True
  arguments to be patched, which may cause unexpected results.
• Fix returning the original values of certain threading
  attributes from :func:gevent.monkey.get_original.