method returning either the lower part of the stored value (intermediate node) or the lowest bit set (bit vector mode). If the node does not contain any value (min > max or value == 0) Nullable.null is returned.
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method returning either the lower part of the stored value (intermediate node) or the lowest bit set (bit vector mode). If the node does not contain any value (min > max or value == 0) Nullable.null is returned.