I'm migrating from fast_jsonapi and before relationships with a namespaced model would resolve to a serializer that included the namespace, but now they get ignored.

Given the following serializer:

class Serializers::OrderSerializer
  has_many :items, polymorphic: true
end

If an item had a class Order::Book it would resolve to Serializers::Order::BookSerializer, but now it resolves to just Serializers::BookSerializer.

Was this an intended change? I would expect the previous behaviour, if I also had un-namespaced Book class and serializer I would be forced to manually handle resolving all serializers for items.