https://git.ruby-lang.org/ruby.git/commit/?id=c110ade0d2

From c110ade0d235391c2fbfe9291250f744b735a1a8 Mon Sep 17 00:00:00 2001
From: Jean Boussier <jean.boussier@g...>
Date: Thu, 11 Feb 2021 18:30:58 +0100
Subject: [ruby/psych] Fix custom marshalization with symbolize_names: true

https://github.com/ruby/psych/commit/ee26f26ab5
---
 ext/psych/lib/psych/visitors/to_ruby.rb | 6 +++---
 test/psych/test_marshalable.rb          | 8 ++++++++
 2 files changed, 11 insertions(+), 3 deletions(-)

diff --git a/ext/psych/lib/psych/visitors/to_ruby.rb b/ext/psych/lib/psych/visitors/to_ruby.rb
index a100188..4d98850 100644
--- a/ext/psych/lib/psych/visitors/to_ruby.rb
+++ b/ext/psych/lib/psych/visitors/to_ruby.rb
@@ -339,7 +339,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L339
         list
       end
 
-      def revive_hash hash, o
+      def revive_hash hash, o, tagged= false
         o.children.each_slice(2) { |k,v|
           key = accept(k)
           val = accept(v)
@@ -366,7 +366,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L366
               hash[key] = val
             end
           else
-            if @symbolize_names
+            if !tagged && @symbolize_names
               key = key.to_sym
             elsif !@freeze
               key = deduplicate(key)
@@ -404,7 +404,7 @@ module Psych https://github.com/ruby/ruby/blob/trunk/ext/psych/lib/psych/visitors/to_ruby.rb#L404
 
       def revive klass, node
         s = register(node, klass.allocate)
-        init_with(s, revive_hash({}, node), node)
+        init_with(s, revive_hash({}, node, true), node)
       end
 
       def init_with o, h, node
diff --git a/test/psych/test_marshalable.rb b/test/psych/test_marshalable.rb
index b1f4a83..152cc4e 100644
--- a/test/psych/test_marshalable.rb
+++ b/test/psych/test_marshalable.rb
@@ -51,5 +51,13 @@ module Psych https://github.com/ruby/ruby/blob/trunk/test/psych/test_marshalable.rb#L51
       assert(PsychCustomMarshalable === loaded)
       assert_equal(2, loaded.foo)
     end
+
+    def test_init_symbolize_names
+      obj = PsychCustomMarshalable.new(1)
+      loaded = Psych.load(Psych.dump(obj), symbolize_names: true)
+
+      assert(PsychCustomMarshalable === loaded)
+      assert_equal(2, loaded.foo)
+    end
   end
 end
-- 
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