Some issue with UUID in uri

Given the following setup, the response contains an invalid 'uri' value:

"d": { ": { "uri": "http://localhost:9494/entities(4554f31a-7382-43eb-bfb4-b93ab4a0de51)", "type": "Entity" }

The following version works, but I'm not sure 'guid' is equivalent of 'uuid':

http://localhost:7000/entities(guid'4554f31a-7382-43eb-bfb4-b93ab4a0de51')

require 'safrano'

DB = Sequel.connect ENV['DB_URL']
DB.extension :pg_enum
Sequel::Model.db = DB

DB.execute 'CREATE EXTENSION IF NOT EXISTS "uuid-ossp"'

DB.create_table? :entities do
  uuid :id, primary_key: true, default: Sequel.function(:uuid_generate_v4)
  foreign_key :parent_id
  String  :name
end

class Entity < Sequel::Model
  one_to_many :children, key: :parent_id, class: self
end

  class ODataSrv < Safrano::ServerApp
  publish_service do
    publish_model Entity, :entities do
      add_nav_prop_collection :children
    end
  end
end

run ODataSrv.new