Note that SDL_UserEvent and SDL_Event type are intentionally Uint32

include/SDL3/SDL_events.h

@@ -697,7 +697,7 @@ typedef struct SDL_QuitEvent
  */
 typedef struct SDL_UserEvent
 {
-    Uint32 type;        /**< ::SDL_EVENT_USER through ::SDL_EVENT_LAST-1 */
+    Uint32 type;        /**< ::SDL_EVENT_USER through ::SDL_EVENT_LAST-1, Uint32 because these are not in the SDL_EventType enumeration */
     Uint32 reserved;
     Uint64 timestamp;   /**< In nanoseconds, populated using SDL_GetTicksNS() */
     SDL_WindowID windowID; /**< The associated window if any */
@@ -712,7 +712,7 @@ typedef struct SDL_UserEvent
  */
 typedef union SDL_Event
 {
-    Uint32 type;                            /**< Event type, shared with all events */
+    Uint32 type;                            /**< Event type, shared with all events, Uint32 to cover user events which are not in the SDL_EventType enumeration */
     SDL_CommonEvent common;                 /**< Common event data */
     SDL_DisplayEvent display;               /**< Display event data */
     SDL_WindowEvent window;                 /**< Window event data */