Namespaced resources don't infer namespaced model_name

I don't know if this is by design or a bug, but given the follwing model and resource, the resource cannot infer the model name because of demodulize in https://github.com/cerebris/jsonapi-resources/blob/5af1f17068b66b0a17b7b69e5db334c640f6f34b/lib/jsonapi/resource.rb#L925

# model
module Foo
  class Bar < ApplicationRecord
  end
end

# resource
module Foo
  class BarResource < JSONAPI::Resource
    # model_name Foo::Bar' <= with this, things work fine, without, you'll get a warn "[MODEL NOT FOUND] warning
  end
end

If the resource is defined inside a module, should't we prefix the model_name with the same module by default to permit model_name inferring ?

Start at lib/jsonapi/resource.rb around line 925 and reproduce the Foo::Bar and Foo::BarResource example from the issue. The work is done when a resource defined inside a module infers the matching namespaced model without an explicit model_name and no MODEL NOT FOUND warning.