there is no way to pass an empty array via Python dict to C nvlist

[avg-I]

C code allows to place an empty array of a specified type into an nvlist_t object,
but on the Python side it is currently impossible to deduce the intended value type
from an empty array. Also, at present there is no way to provide the type explicitly.

[huoyingyangjie]

what's the specific case ？

[avg-I]

I do not have any practical use-case, that's why this is a low priority issues.