empty:       <NULL>
append:      100 101 102 103 104 105 106 107 108 109
append_len:  100 101 102 103 104 105 106 107 108 109 2 4 8 16
truncate:    100 101 102 103 104 105 106 107
concat:      100 101 102 103 104 105 106 107 7 6 5 4
[3] is:      103
array asg:   100 101 102 103 104 99 106 107 7 6 5 4
set:         100 101 102 103 104 99 106 107 7 6 5 4 0 0 0 77
remove:      100 101 99 106 107 7 6 5 4 0 0 0 77