depend on Zeitwerk 1.4.0

Gemfile.lock

@@ -70,7 +70,7 @@ PATH
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-      zeitwerk (~> 1.3, >= 1.3.4)
+      zeitwerk (~> 1.4)
     rails (6.0.0.beta3)
       actioncable (= 6.0.0.beta3)
       actionmailbox (= 6.0.0.beta3)
@@ -517,7 +517,7 @@ GEM
     websocket-extensions (0.1.3)
     xpath (3.2.0)
       nokogiri (~> 1.8)
-    zeitwerk (1.3.4)
+    zeitwerk (1.4.0)
 
 PLATFORMS
   java

activesupport/activesupport.gemspec

@@ -34,5 +34,5 @@ Gem::Specification.new do |s|
   s.add_dependency "tzinfo",          "~> 1.1"
   s.add_dependency "minitest",        "~> 5.1"
   s.add_dependency "concurrent-ruby", "~> 1.0", ">= 1.0.2"
-  s.add_dependency "zeitwerk",        "~> 1.3", ">= 1.3.4"
+  s.add_dependency "zeitwerk",        "~> 1.4"
 end

activesupport/lib/active_support/dependencies/zeitwerk_integration.rb

@@ -21,7 +21,11 @@ module ActiveSupport
         end
 
         def autoloaded_constants
-          (Rails.autoloaders.main.loaded + Rails.autoloaders.once.loaded).to_a
+          cpaths = []
+          Rails.autoloaders.each do |autoloader|
+            cpaths.concat(autoloader.loaded_cpaths.to_a)
+          end
+          cpaths
         end
 
         def autoloaded?(object)