api/src/main/java/jakarta/faces/component/behavior/_DeltaStateHelper.java [795:838]:
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    private static Object saveAttachedState(FacesContext context, Object attachedObject)
    {
        if (context == null)
        {
            throw new NullPointerException ("context");
        }
        
        if (attachedObject == null)
        {
            return null;
        }
        // StateHolder interface should take precedence over
        // List children
        if (attachedObject instanceof StateHolder holder)
        {
            if (holder.isTransient())
            {
                return null;
            }

            return new _AttachedStateWrapper(attachedObject.getClass(), holder.saveState(context));
        }        
        else if (attachedObject instanceof List list)
        {
            List<Object> lst = new ArrayList<Object>(list.size());
            for (Object item : list)
            {
                if (item != null)
                {
                    lst.add(saveAttachedState(context, item));
                }
            }

            return new _AttachedListStateWrapper(lst);
        }
        else if (attachedObject instanceof Serializable)
        {
            return attachedObject;
        }
        else
        {
            return new _AttachedStateWrapper(attachedObject.getClass(), null);
        }
    }
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api/src/main/java/jakarta/faces/component/behavior/BehaviorBase.java [150:193]:
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    private static Object saveAttachedState(FacesContext context, Object attachedObject)
    {
        if (context == null)
        {
            throw new NullPointerException ("context");
        }
        
        if (attachedObject == null)
        {
            return null;
        }
        // StateHolder interface should take precedence over
        // List children
        if (attachedObject instanceof StateHolder holder)
        {
            if (holder.isTransient())
            {
                return null;
            }

            return new _AttachedStateWrapper(attachedObject.getClass(), holder.saveState(context));
        }        
        else if (attachedObject instanceof List list)
        {
            List<Object> lst = new ArrayList<>(list.size());
            for (Object item : list)
            {
                if (item != null)
                {
                    lst.add(saveAttachedState(context, item));
                }
            }

            return new _AttachedListStateWrapper(lst);
        }
        else if (attachedObject instanceof Serializable)
        {
            return attachedObject;
        }
        else
        {
            return new _AttachedStateWrapper(attachedObject.getClass(), null);
        }
    }
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