.shift 2 after shift 2: \\$@

.shift after shift without argument: \\$@

.shift 0 after shift 0: \\$@ .. <\\$*> .. .showargs one two three four five

expand to less than three bytes: .useargs 1

expand to exactly three bytes: .useargs x y

expand to more than three bytes: .useargs "a longer argument..." "and another"