Do not copy compare_by_identity flag for non-empty hashes in Hash.[]

It wasn't copied for empty hashes, and Hash.[] doesn't copy the
default value, so copying the compare_by_identity flag does not
make sense.

Partially Fixes [Bug #19113]

1 files changed, 18 insertions, 0 deletions

diff --git a/spec/ruby/core/hash/constructor_spec.rb b/spec/ruby/core/hash/constructor_spec.rb
index 8fba47958f..8d29773909 100644
--- a/spec/ruby/core/hash/constructor_spec.rb
+++ b/spec/ruby/core/hash/constructor_spec.rb
@@ -103,8 +103,26 @@ describe "Hash.[]" do
     HashSpecs::MyInitializerHash[Hash[1, 2]].should be_an_instance_of(HashSpecs::MyInitializerHash)
   end
 
+  it "removes the default value" do
+    hash = Hash.new(1)
+    Hash[hash].default.should be_nil
+    hash[:a] = 1
+    Hash[hash].default.should be_nil
+  end
+
   it "removes the default_proc" do
     hash = Hash.new { |h, k| h[k] = [] }
     Hash[hash].default_proc.should be_nil
+    hash[:a] = 1
+    Hash[hash].default_proc.should be_nil
+  end
+
+  ruby_version_is '3.3' do
+    it "does not retain compare_by_identity_flag" do
+      hash = {}.compare_by_identity
+      Hash[hash].compare_by_identity?.should == false
+      hash[:a] = 1
+      Hash[hash].compare_by_identity?.should == false
+    end
   end
 end