api/src/main/java/jakarta/faces/component/behavior/_AjaxBehaviorDeltaStateHelper.java [99:123]:
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    public void add(Serializable key, Object value)
    {
        if (_createDeltas())
        {
            //Track delta case
            Map<Object, Boolean> deltaListMapValues = (Map<Object, Boolean>) _deltas.get(key);
            if (deltaListMapValues == null)
            {
                deltaListMapValues = new InternalDeltaListMap<>(3, 1f);
                _deltas.put(key, deltaListMapValues);
            }

            deltaListMapValues.put(value, Boolean.TRUE);
        }

        //Handle change on full map
        List<Object> fullListValues = (List<Object>) _fullState.get(key);
        if (fullListValues == null)
        {
            fullListValues = new InternalList<>(3);
            _fullState.put(key, fullListValues);
        }

        fullListValues.add(value);
    }
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api/src/main/java/jakarta/faces/component/behavior/_DeltaStateHelper.java [195:219]:
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    public void add(Serializable key, Object value)
    {
        if (_createDeltas())
        {
            //Track delta case
            Map<Object, Boolean> deltaListMapValues = (Map<Object, Boolean>) _deltas.get(key);
            if (deltaListMapValues == null)
            {
                deltaListMapValues = new InternalDeltaListMap<>(3, 1f);
                _deltas.put(key, deltaListMapValues);
            }

            deltaListMapValues.put(value, Boolean.TRUE);
        }

        //Handle change on full map
        List<Object> fullListValues = (List<Object>) _fullState.get(key);
        if (fullListValues == null)
        {
            fullListValues = new InternalList<>(3);
            _fullState.put(key, fullListValues);
        }

        fullListValues.add(value);
    }
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