merge 3.4 (#22643)

diff --cc Lib/test/test_unicode.py
Simple merge

diff --cc Misc/NEWS
index ac80d74cb574e6ba277060fdebf9965687df146f,4b4d89df83ba6c0dc920dd6ce078d7b587ab9eea..fd502b6e4a44ad2f18452dc567b9d01063c58e9f
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -10,9 -11,9 +10,12 @@@ Release date: TB
  Core and Builtins
  -----------------
  
+ - Issue #22643: Fix integer overflow in Unicode case operations (upper, lower,
+   title, swapcase, casefold).
+ 
 +- Issue #17636: Circular imports involving relative imports are now
 +  supported.
 +
  - Issue #22604: Fix assertion error in debug mode when dividing a complex
    number by (nan+0j).
  

diff --cc Objects/unicodeobject.c
Simple merge