https://git.ruby-lang.org/ruby.git/commit/?id=665589cbdf

From 665589cbdf7bf652067113dd1c0bc49012b990e0 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@r...>
Date: Tue, 29 Sep 2020 20:33:06 +0900
Subject: merge revision(s) df14c758fc705c49c2aaf4c9276a8f7229438fbf: [Backport
 #17181]

	Make hash returned by Hash#transform_values not have a default

	This sets an explicit default of nil.  There is probably a better
	approach of removing the default.

	Fixes [Bug #17181]

diff --git a/hash.c b/hash.c
index 4a3f2ff..63b228f 100644
--- a/hash.c
+++ b/hash.c
@@ -3211,6 +3211,7 @@ rb_hash_transform_values(VALUE hash) https://github.com/ruby/ruby/blob/trunk/hash.c#L3211
 
     RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
     result = hash_copy(hash_alloc(rb_cHash), hash);
+    SET_DEFAULT(result, Qnil);
 
     if (!RHASH_EMPTY_P(hash)) {
         rb_hash_stlike_foreach_with_replace(result, transform_values_foreach_func, transform_values_foreach_replace, result);
diff --git a/test/ruby/test_hash.rb b/test/ruby/test_hash.rb
index 738b058..046ea40 100644
--- a/test/ruby/test_hash.rb
+++ b/test/ruby/test_hash.rb
@@ -1673,6 +1673,7 @@ class TestHash < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_hash.rb#L1673
     x.default_proc = proc {|h, k| k}
     y = x.transform_values {|v| v ** 2 }
     assert_nil(y.default_proc)
+    assert_nil(y.default)
 
     y = x.transform_values.with_index {|v, i| "#{v}.#{i}" }
     assert_equal(%w(1.0  2.1  3.2), y.values_at(:a, :b, :c))
diff --git a/version.h b/version.h
index d0e742b..41e9b8f 100644
--- a/version.h
+++ b/version.h
@@ -2,11 +2,11 @@ https://github.com/ruby/ruby/blob/trunk/version.h#L2
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 1
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 128
+#define RUBY_PATCHLEVEL 129
 
 #define RUBY_RELEASE_YEAR 2020
 #define RUBY_RELEASE_MONTH 9
-#define RUBY_RELEASE_DAY 20
+#define RUBY_RELEASE_DAY 29
 
 #include "ruby/version.h"
 
-- 
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