buff: "Iorem ipsum dolor", n=0; after call: buff: "Iorem ipsum dolor", n=0;
buff: "Iorem ipsum dolor", n=3; after call: buff: "", n=3;
buff: "Iorem ipsum dolor", n=3; after call: buff: "", n=3;
buff: "Iorem ipsum dolor", n=16; after call: buff: "", n=16;
buff: "Iorem ipsum dolor", n=17; after call: buff: "", n=17;