api/src/main/java/jakarta/faces/component/_DeltaStateHelper.java [574:603]:
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    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
            {
                returnValue = map.remove(valueOrKey);
            }

            if (map.isEmpty())
            {
                //stateMap.remove(key);
                stateMap.put(key, null);
            }
        }
        return returnValue;
    }
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api/src/main/java/jakarta/faces/component/behavior/_DeltaStateHelper.java [466:494]:
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    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
            {
                returnValue = map.remove(valueOrKey);
            }

            if (map.isEmpty())
            {
                stateMap.put(key, null);
            }
        }
        return returnValue;
    }
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