+int sd_bus_message_append_array(sd_bus_message *m, char type, const void *ptr, size_t size);
+int sd_bus_message_append_array_space(sd_bus_message *m, char type, size_t size, void **ptr);
+int sd_bus_message_append_array_memfd(sd_bus_message *m, char type, sd_memfd *memfd);
+int sd_bus_message_append_string_space(sd_bus_message *m, size_t size, char **s);
+int sd_bus_message_append_string_memfd(sd_bus_message *m, sd_memfd* memfd);