#11763: merge with 3.2.

diff --cc Lib/unittest/case.py
Simple merge

diff --cc Lib/unittest/test/test_case.py
Simple merge

diff --cc Misc/NEWS
index e993aceef03e7cefd696ee9877fd65ee4f4aaaaf,005527f1cee7650a8046c567f5f2c14252919c35..364e1f9b74a046e434d53ea241b6ccb2fe9425f5
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -123,25 -66,11 +123,28 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #11763: don't use difflib in TestCase.assertMultiLineEqual if the
+   strings are too long.
+ 
  - Issue #11236: getpass.getpass responds to ctrl-c or ctrl-z on terminal.
  
 +- Issue #11856: Speed up parsing of JSON numbers.
 +
 +- Issue #11005: threading.RLock()._release_save() raises a RuntimeError if the
 +  lock was not acquired.
 +
 +- Issue #11258: Speed up ctypes.util.find_library() under Linux by a factor
 +  of 5 to 10.  Initial patch by Jonas H.
 +
 +- Issue #11382: Trivial system calls, such as dup() or pipe(), needn't
 +  release the GIL.  Patch by Charles-François Natali.
 +
 +- Issue #11223: Add threading._info() function providing informations about
 +  the thread implementation.
 +
 +- Issue #11731: simplify/enhance email parser/generator API by introducing
 +  policy objects.
 +
  - Issue #11768: The signal handler of the signal module only calls
    Py_AddPendingCall() for the first signal to fix a deadlock on reentrant or
    parallel calls. PyErr_SetInterrupt() writes also into the wake up file.