Let's say I have some capnp schema.capnp file:
```
struct Foo {
bar :group {
someValue @0 :Int64;
}
}
```
In python I do something like:
```
import capnp
import schema_capnp
fp = open("some_capture.bin")
obj = schema_capnp.Foo.read(fp)
copied_bar = copy(obj.bar) <--- Here
```
I'm trying to figure out how to create the copied_bar object without really
having to know what the underlying type is. The specific use-case is I have
covariant groups in different structs so it's a little more complex than
this simple case. I want to create a copy so that I'm not accidentally
modifying the underlying instance (I recognize there's a reader in this
case which probably won't allow modifying - I'm talking about the general
case).
Thanks,
Vitali
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