=== Action API changes in 1.33 ===
* (T198913) Added 'ApiOptions' hook.
* The JSON formatversion=2 is no longer experimental.
+* Internal API errors (those with code beginning "internal_api_error") will
+ include the exception class name in a data field named "errorclass".
+ * Class names are not guaranteed to remain stable, and in particular database
+ exceptions will now include the "Wikimedia\Rdbms\" prefix in the class name.
+ * The code including an exception class name is deprecated. In the future,
+ all internal errors will use code "internal_api_error".
* …
=== Action API internal changes in 1.33 ===