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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