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serhiy-storchaka · Dec 24, 2023 · 29bc26b · 29bc26b
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diff --git a/Doc/library/json.rst b/Doc/library/json.rst
@@ -486,6 +486,10 @@ Encoders and Decoders
    .. versionchanged:: 3.6
       All parameters are now :ref:`keyword-only <keyword-only_parameter>`.
 
+   .. versionchanged:: 3.13
+      :exc:`TypeError` is raised if the default serialization function
+      returns a result of the same type as the input.
+
 
    .. method:: default(o)
 

diff --git a/Doc/whatsnew/3.13.rst b/Doc/whatsnew/3.13.rst
@@ -1163,6 +1163,10 @@ Changes in the Python API
   other "private" attributes.
   (See :gh:`112826`.)
 
+* :exc:`TypeError` is now raised in the :mod:`json` encoder if the default
+  serialization function returns a result of the same type as the input.
+  (Contributed by soolabettu and Serhiy Storchaka in :gh:`74917`.)
+
 
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diff --git a/Misc/NEWS.d/next/Library/2023-12-24-15-39-00.gh-issue-74917.48uE7k.rst b/Misc/NEWS.d/next/Library/2023-12-24-15-39-00.gh-issue-74917.48uE7k.rst
@@ -0,0 +1,2 @@
+:exc:`TypeError` is now raised in the :mod:`json` encoder if the default
+serialization function returns a result of the same type as the input.
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1,2 @@
		:exc:`TypeError` is now raised in the :mod:`json` encoder if the default
		serialization function returns a result of the same type as the input.