Add a news article about changes to JSON default values representation in Java, C++, and Python.

PiperOrigin-RevId: 604390039
Change-Id: I72a6d70c7f93ef2a5bed1664496bb037a1621c4c

Author: Protocol Buffer Team

content/news/2022-02-05.md

@@ -0,0 +1,26 @@
++++
+title = "Changes announced February 5, 2024"
+linkTitle = "February 5, 2024"
+toc_hide = "true"
+description = "Changes announced for Protocol Buffers on February 5, 2024."
+type = "docs"
++++
+
+This topic covers breaking changes in Java, C++, and Python in the 26.x line.
+
+## JSON Formatter Option Changes {#JSON}
+
+Starting in the 26.x line, the JSON formatter option to print default-valued
+fields is replaced with a fixed way to handle proto2 and proto3 `optional`
+fields consistently.
+
+*   Java: `includingDefaultValueFields()` is replaced with
+    `alwaysPrintFieldsWithNoPresence()`.
+*   C++: `always_print_default_values` is replaced with
+    `always_print_fields_with_no_presence=True`.
+*   Py: `including_default_value_fields=True` is replaced with
+    `always_print_fields_with_no_presence=True`.
+
+The new flag behaves identically to the old flag on proto3 messages, but no
+longer applies to proto2 `optional` fields. The old flags applied to proto2
+`optional` fields but not proto3 `optional` fields.

content/news/_index.md

@@ -9,6 +9,8 @@ no_list = "true"
 News topics provide information about past events and changes with Protocol
 Buffers, and plans for upcoming changes.
 
+*   [February 5, 2024](/news/2024-02-05) - Breaking
+    changes in Java, C++, and Python in the 26.x line.
 *   [January 31, 2024](/news/2024-01-31) - Breaking
     changes in the 26.x line for Python
 *   [January 5, 2024](/news/2024-01-05) - Breaking