[v8-users] How does one schedule a weak handle callback with internal fields?

[A.M.]

Calling `SetWeak` like this:

global_handle.SetWeak(parameter, &X::WeakCallback, v8::WeakCallbackType::
kInternalFields);

, against a handle that contains an object with internal fields calls 
`X::WeakCallback` with the parameter and both internal fields of 
`v8::WeakCallbackInfo<v8::Global<v8::Object>>` always return `NULL`. 

Looking at 
`v8::internal::GlobalHandles::Node::PostGarbageCollectionProcessing`, which 
calls the weak callback, those internal fields are always `NULL`:

    void* embedder_fields[v8::kEmbedderFieldsInWeakCallback] = {nullptr,
                                                                nullptr};
    v8::WeakCallbackInfo<void> data(reinterpret_cast<v8::Isolate*>(isolate),
                                    parameter(), embedder_fields, nullptr);
    weak_callback_(data);


Is that some experimental feature or there's some way to make object's 
internal fields available within the weak callback?

Thanks


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