address review: adjust news

Author: skirpichev

Doc/deprecations/pending-removal-in-3.20.rst

@@ -39,7 +39,8 @@ Pending removal in Python 3.20
 
   (Contributed by Hugo van Kemenade and Stan Ulbrych in :gh:`76007`.)
 
-* The ``__getformat__()`` class method of the :class:`float` is deprecated
-  and will be removed in Python 3.20.
-
+* The ``__getformat__()`` class method of the :class:`float` is deprecated and
+  will be removed in Python 3.20.  On CPython, ``float.__getformat__()`` always
+  return a string, prefixed with ``"IEEE"``: to build CPython, you need support
+  for IEEE 754 floating-point numbers since Python 3.11.
   (Contributed by Sergey B Kirpichev in :gh:`145633`.)

Doc/whatsnew/3.15.rst

@@ -1644,9 +1644,10 @@ New deprecations
   * Deprecated :func:`!typing.no_type_check_decorator` has been removed.
     (Contributed by Nikita Sobolev in :gh:`133601`.)
 
-* The ``__getformat__()`` class method of the :class:`float` is deprecated
-  and will be removed in Python 3.20.
-
+* The ``__getformat__()`` class method of the :class:`float` is deprecated and
+  will be removed in Python 3.20.  On CPython, ``float.__getformat__()`` always
+  return a string, prefixed with ``"IEEE"``: to build CPython, you need support
+  for IEEE 754 floating-point numbers since Python 3.11.
   (Contributed by Sergey B Kirpichev in :gh:`145633`.)
 
 * ``__version__``

Misc/NEWS.d/next/Core_and_Builtins/2026-03-24-17-29-19.gh-issue-145633.RtktKR.rst

@@ -1,2 +1,4 @@
-The ``__getformat__()`` class method of the :class:`float` is deprecated.
-Patch by Sergey B Kirpichev.
+The ``__getformat__()`` class method of the :class:`float` is deprecated.  On
+CPython, ``float.__getformat__()`` always return a string, prefixed with
+``"IEEE"``: to build CPython, you need support for IEEE 754 floating-point
+numbers since Python 3.11.  Patch by Sergey B Kirpichev.