Issue #18339: Negative ints keys in unpickler.memo dict no longer cause a

segfault inside the _pickle C extension.

diff --cc Misc/NEWS
index 92d7c394ffe07d3055a78a121c34104fedf0de75,37ee7fc79e7488b02c6214408b6a25ebb29f7998..ed51b38f1fc2e369b70b18d4c35b6a016422f8b4
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -135,9 -38,9 +135,12 @@@ Core and Builtin
  Library
  -------
  
+ - Issue #18339: Negative ints keys in unpickler.memo dict no longer cause a
+   segfault inside the _pickle C extension.
+ 
 +- Issue 18240: The HMAC module is no longer restricted to bytes and accepts
 +  any bytes-like object, e.g. memoryview. Original patch by Jonas Borgström.
 +
  - Issue #18224: Removed pydoc script from created venv, as it causes problems
    on Windows and adds no value over and above python -m pydoc ...
  

diff --cc Modules/_pickle.c
Simple merge