1 adding bar

     2 adding foo

     3 % state dump

     4 a 644          0 baz

     5 n 644          0 foo

     6 r   0          0 bar

     7 % status

     8 A baz

     9 R bar

    10 C foo

    11 % state dump

    12 n 666         -1 bar

    13 n 666         -1 foo

    14 % status

    15 ! bar

    16 ? baz

    17 C foo