Issue #27581: Merge overflow fix from 3.5

diff --cc Misc/NEWS
index 9be9f79188e1f8fb13e6a1f1ca9962e802107fcc,2e28d901060106ef8ae0785b09f674d5f83eb7f4..80c6573ee49fa4be5815a6c6bf81624974ddab82
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -13,15 -13,23 +13,18 @@@ Core and Builtin
  - Issue #27507: Add integer overflow check in bytearray.extend().  Patch by
    Xiang Zhang.
  
 -- Issue #27443: __length_hint__() of bytearray iterators no longer return a
 -  negative integer for a resized bytearray.
+ - Issue #27581: Don't rely on wrapping for overflow check in
+   PySequence_Tuple().  Patch by Xiang Zhang.
+ 
 +- Issue #27419: Standard __import__() no longer look up "__import__" in globals
 +  or builtins for importing submodules or "from import".  Fixed a crash if
 +  raise a warning about unabling to resolve package from __spec__ or
 +  __package__.
 +
 +- Issue #27083: Respect the PYTHONCASEOK environment variable under Windows.
 +
 +- Issue #27514: Make having too many statically nested blocks a SyntaxError
 +  instead of SystemError.
  
  Library
  -------

diff --cc Objects/abstract.c
Simple merge