https://git.ruby-lang.org/ruby.git/commit/?id=daec109f42

From daec109f423e54094800e083fc8a8ca5cbceb866 Mon Sep 17 00:00:00 2001
From: Marc-Andre Lafortune <github@m...>
Date: Tue, 22 Dec 2020 21:29:00 -0500
Subject: [ruby/psych] Optimize cache with `compare_by_identity`

Using `compare_by_identity` gives a 4x performance boost on cache hits.
Benchmark in https://github.com/JuanitoFatas/fast-ruby/issues/189

diff --git a/ext/psych/lib/psych/visitors/visitor.rb b/ext/psych/lib/psych/visitors/visitor.rb
index 35f8f81..e2585c0 100644
--- a/ext/psych/lib/psych/visitors/visitor.rb
+++ b/ext/psych/lib/psych/visitors/visitor.rb
@@ -12,7 +12,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/visitor.rb#L12
       def self.dispatch_cache
         Hash.new do |hash, klass|
           hash[klass] = :"visit_#{klass.name.gsub('::', '_')}"
-        end
+        end.compare_by_identity
       end
 
       if defined?(Ractor)
diff --git a/ext/psych/lib/psych/visitors/yaml_tree.rb b/ext/psych/lib/psych/visitors/yaml_tree.rb
index 986c57b..ac6777a 100644
--- a/ext/psych/lib/psych/visitors/yaml_tree.rb
+++ b/ext/psych/lib/psych/visitors/yaml_tree.rb
@@ -80,7 +80,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/yaml_tree.rb#L80
           raise(TypeError, "Can't dump #{target.class}") unless method
 
           h[klass] = method
-        end
+        end.compare_by_identity
       end
 
       def start encoding = Nodes::Stream::UTF8
diff --git a/test/psych/test_ractor.rb b/test/psych/test_ractor.rb
index 90e4036..2f8d5ca 100644
--- a/test/psych/test_ractor.rb
+++ b/test/psych/test_ractor.rb
@@ -24,6 +24,9 @@ class TestPsychRactor < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/psych/test_ractor.rb#L24
   end
 
   def test_ractor_config
+    # Config is ractor-local
+    # Test is to make sure it works, even though usage is probably very low.
+    # The methods are not documented and might be deprecated one day
     assert_ractor(<<~RUBY, require_relative: 'helper')
       r = Ractor.new do
         Psych.add_builtin_type 'omap' do |type, val|
-- 
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