Create a value unplacking object that records it is stored by name object_name (eager pipe version).
UnpackerP(object_name = NULL)
| object_name | character, name the object is stored as |
|---|
an unpacker
Array-assign form can not use the names: ., wrapr_private_self, value, or the name stored in object_name.
function form can not use the names: . or wrapr_private_value.
Array-form with =, <-, -> will write own name into working environment
as a side-effect. Array-form with := does not have the side-effect.