what is pending of listpermissions？？

Question

One arguments of listpermissions "verbose" ,will returns list of pending grants.

but i always return empty in pending.

like

[
    {
        "address" : "19LrqbAWXyaMVnjKzc6A4g4GJ55QxJD3RJ",
        "for" : null,
        "type" : "send",
        "startblock" : 10000,
        "endblock" : 20000,
        "roots" : [
            "1Hu44T3agUHecCFHKfArrP1G5QjNYgKcPu"
        ],
        "pending" : [
        ]
    }
]

so what situation is not empty. Thx

Answer 1

The pending field provides a list of changes to this permission which are "in the middle", because some admin has initiated the permission change, but a certain level of admin consensus (based on other admin actions) is required in order to complete and effect it.