From a3744458d3f09a075a263a134bff6790523460c6 Mon Sep 17 00:00:00 2001
From: mrhoribu <15917743+mrhoribu@users.noreply.github.com>
Date: Sat, 24 Oct 2026 11:26:02 -0400
Subject: [PATCH] Set compare_by_identity changes were backported to 4.0

The fix for [Bug #22174] was backported to Ruby 4.0.8.
See https://bugs.ruby-lang.org/issues/22174

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
---
 core/set/classify_spec.rb     | 2 +-
 core/set/divide_spec.rb       | 2 +-
 core/set/flatten_spec.rb      | 4 ++--
 core/set/intersection_spec.rb | 2 +-
 core/set/map_spec.rb          | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/core/set/classify_spec.rb b/core/set/classify_spec.rb
index a9521d3b5..a2d27cf3d 100644
--- a/core/set/classify_spec.rb
+++ b/core/set/classify_spec.rb
@@ -24,7 +24,7 @@
     classified.should == { 3 => Set["one", "two"], 4 => Set["four"], 5 => Set["three"] }
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag" do
       set = Set["one", "two"].compare_by_identity
       classified = set.classify { |x| x.length }
diff --git a/core/set/divide_spec.rb b/core/set/divide_spec.rb
index 96880db9b..5527ced8d 100644
--- a/core/set/divide_spec.rb
+++ b/core/set/divide_spec.rb
@@ -18,7 +18,7 @@
     ret.each(&:even?).should == Set[Set[1, 3], Set[2, 4]]
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag" do
       set = Set["one", "two"].compare_by_identity
       res = set.divide { |x| x.length }
diff --git a/core/set/flatten_spec.rb b/core/set/flatten_spec.rb
index 9fc05ea37..21a89fbd2 100644
--- a/core/set/flatten_spec.rb
+++ b/core/set/flatten_spec.rb
@@ -16,7 +16,7 @@
     -> { set.flatten }.should.raise(ArgumentError)
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag" do
       set = Set[1, 2, Set[3, 4]].compare_by_identity
       set.flatten.compare_by_identity?.should == true
@@ -59,7 +59,7 @@
     -> { set.flatten! }.should.raise(ArgumentError)
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag when flattening elements" do
       set = Set[1, 2, Set[3, 4]].compare_by_identity
       set.flatten!
diff --git a/core/set/intersection_spec.rb b/core/set/intersection_spec.rb
index 2e1388e0c..61ba61455 100644
--- a/core/set/intersection_spec.rb
+++ b/core/set/intersection_spec.rb
@@ -21,7 +21,7 @@
     -> { @set & Object.new }.should.raise(ArgumentError)
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag" do
       @set.compare_by_identity
       (@set & Set[:b, :c, :d, :e]).compare_by_identity?.should == true
diff --git a/core/set/map_spec.rb b/core/set/map_spec.rb
index 7121afc45..c626912a2 100644
--- a/core/set/map_spec.rb
+++ b/core/set/map_spec.rb
@@ -20,7 +20,7 @@
     @set.should == Set[2, 4, 6, 8, 10]
   end
 
-  ruby_version_is "4.1" do
+  ruby_version_is "4.0" do
     it "retains compare_by_identity flag" do
       @set.compare_by_identity
       @set.map! { |x| x * 2 }