taxonomy_select_nodes a bit confusing

The function taxonomy_select_nodes has the description "Finds all nodes that match selected taxonomy conditions." but if I understand this function correctly it doesn't return all nodes, only nodes up to a set value (variable_get('default_nodes_main', 10) or variable_get('feed_default_items', 10)). It would be nice if it was possible to get all nodes or at least documented that you don't get all nodes.