Document the dataclasses.field() change

Author: vstinner

Doc/library/dataclasses.rst

@@ -333,6 +333,10 @@ Module contents
    :attr:`!C.t` will be ``20``, and the class attributes :attr:`!C.x` and
    :attr:`!C.y` will not be set.
 
+   .. versionchanged:: next
+      If *metadata* is ``None``, use an empty :class:`frozendict`, instead
+      of a :func:`~types.MappingProxyType` of an empty :class:`dict`.
+
 .. class:: Field
 
    :class:`!Field` objects describe each defined field. These objects

Misc/NEWS.d/next/Library/2026-02-19-18-02-54.gh-issue-141510.qzvYsO.rst

@@ -0,0 +1,3 @@
+:func:`dataclasses.field`: if *metadata* is ``None``, use an empty
+:class:`frozendict`, instead of a :func:`~types.MappingProxyType` of an
+empty :class:`dict`. Patch by Victor Stinner.