/// Retrieves tagged type of `T` handle.
template <class T>
inline TaggedValue::Type TypeToTaggedType() {}
/// Retrieves tagged type of base class handle.
template <>
inline TaggedValue::Type TypeToTaggedType<Handle>() {
  return TaggedValue::Type::NONE;
}
/// Retrieves tagged type of None handle.
template <>
inline TaggedValue::Type TypeToTaggedType<None>() {
  return TaggedValue::Type::NONE;
}