merge 3.4 (#23367)

diff --cc Misc/NEWS
index 211303985eb4167da9b7b9ccac3b36a8539820fd,f71bd506c07bfa549524b191fe8bbb244a971b85..23371fa55fa5f2a1cd36eec23608500e0b802b94
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -61,29 -51,12 +61,31 @@@ Librar
  - Issue #23146: Fix mishandling of absolute Windows paths with forward
    slashes in pathlib.
  
 +- Issue #23096: Pickle representation of floats with protocol 0 now is the same
 +  for both Python and C implementations.
 +
 +- Issue #19105: pprint now more efficiently uses free space at the right.
 +
 +- Issue #14910: Add allow_abbrev parameter to argparse.ArgumentParser. Patch by
 +  Jonathan Paugh, Steven Bethard, paul j3 and Daniel Eriksson.
 +
 +- Issue #21717: tarfile.open() now supports 'x' (exclusive creation) mode.
 +
 +- Issue #23344: marshal.dumps() is now 20-25% faster on average.
 +
 +- Issue #20416: marshal.dumps() with protocols 3 and 4 is now 40-50% faster on
 +  average.
 +
  - Issue #23421: Fixed compression in tarfile CLI.  Patch by wdv4758h.
  
+ - Issue #23367: Fix possible overflows in the unicodedata module.
+ 
  - Issue #23361: Fix possible overflow in Windows subprocess creation code.
  
 +- logging.handlers.QueueListener now takes a respect_handler_level keyword
 +  argument which, if set to True, will pass messages to handlers taking handler
 +  levels into account.
 +
  Build
  -----