0
[data=<uninitialized>]
1
T
42
F
[data=<uninitialized>]
2
[data=broker::data{{bye -> 7, hi -> 42}}], {
[bye] = 7,
[hi] = 42
}
| [key=[data=broker::data{bye}], val=[data=broker::data{7}]]
| [key=[data=broker::data{hi}], val=[data=broker::data{42}]]

[data=broker::data{7}]
[data=broker::data{{bye -> 37, hi -> 42}}], {
[bye] = 37,
[hi] = 42
}

2
37
[data=broker::data{42}]
1
[data=<uninitialized>]
1
T
0
[data=broker::data{{}}], {

}