No need for Railtie => Hooks => ArrayExtension. Just directly load ArrayExtension when loading the gem

kaminari-core/lib/kaminari/core.rb

@@ -14,9 +14,8 @@ require 'kaminari/exceptions'
 require 'kaminari/helpers/paginator'
 require 'kaminari/models/page_scope_methods'
 require 'kaminari/models/configuration_methods'
-require 'kaminari/hooks'
+require 'kaminari/models/array_extension'
 
-# if not using Railtie, call `Kaminari::Hooks.init` directly
 if defined? ::Rails::Railtie
   require 'kaminari/railtie'
   require 'kaminari/engine'

kaminari-core/lib/kaminari/hooks.rb

@@ -1,7 +0,0 @@
-module Kaminari
-  class Hooks
-    def self.init
-      require 'kaminari/models/array_extension'
-    end
-  end
-end

kaminari-core/lib/kaminari/railtie.rb

@@ -1,7 +1,7 @@
 module Kaminari
   class Railtie < ::Rails::Railtie #:nodoc:
+    # Doesn't actually do anything. Just keeping this hook point, mainly for compatibility
     initializer 'kaminari' do
-      Kaminari::Hooks.init
     end
   end
 end