api/src/main/java/jakarta/faces/component/_DeltaStateHelper.java [528:591]:
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                returnValue = _removeValueOrKeyFromCollectionDelta(_deltas, key, valueOrKey);
                _removeValueOrKeyFromCollection(_fullState, key, valueOrKey);
            }
            else
            {
                returnValue = _removeValueOrKeyFromCollection(_fullState, key, valueOrKey);
            }
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromCollectionDelta(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey)
    {
        Object returnValue = null;
        Map<Object, Boolean> c = (Map<Object, Boolean>) stateMap.get(key);
        if (c != null)
        {
            if (c.containsKey(valueOrKey))
            {
                returnValue = valueOrKey;
            }
            c.put(valueOrKey, Boolean.FALSE);
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromCollection(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey)
    {
        Object returnValue = null;
        Collection c = (Collection) stateMap.get(key);
        if (c != null)
        {
            if (c.remove(valueOrKey))
            {
                returnValue = valueOrKey;
            }
            if (c.isEmpty())
            {
                stateMap.remove(key);
            }
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromMap(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey, boolean delta)
    {
        if (valueOrKey == null)
        {
            return null;
        }

        Object returnValue = null;
        Map<String, Object> map = (Map<String, Object>) stateMap.get(key);
        if (map != null)
        {
            if (delta)
            {
                // Keep track of the removed values using key/null pair on the delta map
                returnValue = map.put((String) valueOrKey, null);
            }
            else
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api/src/main/java/jakarta/faces/component/behavior/_AjaxBehaviorDeltaStateHelper.java [313:376]:
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                returnValue = _removeValueOrKeyFromCollectionDelta(_deltas, key, valueOrKey);
                _removeValueOrKeyFromCollection(_fullState, key, valueOrKey);
            }
            else
            {
                returnValue = _removeValueOrKeyFromCollection(_fullState, key, valueOrKey);
            }
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromCollectionDelta(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey)
    {
        Object returnValue = null;
        Map<Object, Boolean> c = (Map<Object, Boolean>) stateMap.get(key);
        if (c != null)
        {
            if (c.containsKey(valueOrKey))
            {
                returnValue = valueOrKey;
            }
            c.put(valueOrKey, Boolean.FALSE);
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromCollection(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey)
    {
        Object returnValue = null;
        Collection c = (Collection) stateMap.get(key);
        if (c != null)
        {
            if (c.remove(valueOrKey))
            {
                returnValue = valueOrKey;
            }
            if (c.isEmpty())
            {
                stateMap.remove(key);
            }
        }
        return returnValue;
    }

    private static Object _removeValueOrKeyFromMap(
            Map<Serializable, Object> stateMap, Serializable key, Object valueOrKey, boolean delta)
    {
        if (valueOrKey == null)
        {
            return null;
        }

        Object returnValue = null;
        Map<String, Object> map = (Map<String, Object>) stateMap.get(key);
        if (map != null)
        {
            if (delta)
            {
                // Keep track of the removed values using key/null pair on the delta map
                returnValue = map.put((String) valueOrKey, null);
            }
            else
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