check (node != NULL);
check (!utf8_strcasecmp (key, stringi_map_node_get_key (node)));
check (!strcmp (value, stringi_map_node_get_value (node)));
check (node != NULL);
check (!utf8_strcasecmp (key, stringi_map_node_get_key (node)));
check (!strcmp (value, stringi_map_node_get_value (node)));