Add a What's New entry.

serhiy-storchaka · Dec 4, 2023 · f831920 · f831920
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diff --git a/Doc/library/sys.rst b/Doc/library/sys.rst
@@ -1210,7 +1210,7 @@ always available.
    Return :const:`True` if the given string is "interned", :const:`False`
    otherwise.
 
-   .. versionadded:: 3.12
+   .. versionadded:: 3.13
 
    .. impl-detail::
 

diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
@@ -297,6 +297,13 @@ sqlite3
   object is not :meth:`closed <sqlite3.Connection.close>` explicitly.
   (Contributed by Erlend E. Aasland in :gh:`105539`.)
 
+sys
+---
+
+* Add the :func:`sys._is_interned` function to test if the string was interned.
+  This function is not guaranteed to exist in all implementations of Python.
+  (Contributed by Serhiy Storchaka in :gh:`78573`.)
+
 tkinter
 -------